Last data update: Mar 21, 2025. (Total: 48935 publications since 2009)
Records 1-25 (of 25 Records) |
Query Trace: Leach A[original query] |
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Epidemiologic and genomic characterization of an outbreak of Rift Valley fever among humans and dairy cattle in northern Tanzania
Madut DB , Rubach MP , Allan KJ , Thomas KM , de Glanville WA , Halliday JEB , Costales C , Carugati M , Rolfe RJ , Bonnewell JP , Maze MJ , Mremi AR , Amsi PT , Kalengo NH , Lyamuya F , Kinabo GD , Mbwasi R , Kilonzo KG , Maro VP , Mmbaga BT , Lwezaula B , Mosha C , Marandu A , Kibona TJ , Zhu F , Chawla T , Chia WN , Anderson DE , Wang LF , Liu J , Houpt ER , Martines RB , Zaki SR , Leach A , Gibbons A , Chiang CF , Patel K , Klena JD , Cleaveland S , Crump JA . J Infect Dis 2024 ![]() ![]() BACKGROUND: A peri-urban outbreak of Rift Valley fever virus (RVFV) among dairy cattle from May through August 2018 in northern Tanzania was detected through testing samples from prospective livestock abortion surveillance. We sought to identify concurrent human infections, their phylogeny, and epidemiologic characteristics in a cohort of febrile patients enrolled from 2016-2019 at hospitals serving the epizootic area. METHODS: From September 2016 through May 2019, we conducted a prospective cohort study that enrolled febrile patients hospitalized at two hospitals in Moshi, Tanzania. Archived serum, plasma, or whole blood samples were retrospectively tested for RVFV by PCR. Human samples positive for RVFV were sequenced and compared to RVFV sequences obtained from cattle through a prospective livestock abortion study. Phylogenetic analysis was performed on complete RVFV genomes. RESULTS: Among 656 human participants, we detected RVFV RNA in four (0.6%), including one death with hepatic necrosis and other end-organ damage at autopsy. Humans infected with RVFV were enrolled from June through August 2018, and all resided in or near urban areas. Phylogenetic analysis of human and cattle RVFV sequences demonstrated that most clustered to lineage B, a lineage previously described in East Africa. A lineage E strain clustering with lineages in Angola was also identified in cattle. CONCLUSION: We provide evidence that an apparently small RVFV outbreak among dairy cattle in northern Tanzania was associated with concurrent severe and fatal infections among humans. Our findings highlight the unidentified scale and diversity of inter-epizootic RVFV transmission, including near and within an urban area. |
Lymphocytic choriomeningitis virus in person living with HIV, Connecticut, USA, 2021
Dyal J , Gandhi S , Cossaboom CM , Leach A , Patel K , Golden M , Canterino J , Landry ML , Cannon D , Choi M , Krapiunaya I , Klena JD , Shoemaker T . Emerg Infect Dis 2023 29 (9) 1886-1889 Lymphocytic choriomeningitis virus is an underreported cause of miscarriage and neurologic disease. Surveillance remains challenging because of nonspecific symptomatology, inconsistent case reporting, and difficulties with diagnostic testing. We describe a case of acute lymphocytic choriomeningitis virus disease in a person living with HIV in Connecticut, USA, identified by using quantitative reverse transcription PCR. |
Laboratory Analysis of an Outbreak of Candida auris in New York from 2016 to 2018-Impact and Lessons Learned (preprint)
Zhu Y , O'Brien B , Leach L , Clark A , Bates M , Adams E , Ostrowsky B , Quinn M , Dufort E , Southwick K , Erazo R , Haley VB , Bucher C , Chaturvedi V , Limberger RJ , Blog D , Lutterloh E , Chaturvedi S . bioRxiv 2019 760090 Candida auris is a multidrug-resistant yeast which has emerged in healthcare facilities worldwide, however little is known about identification methods, patient colonization, spread, environmental survival, and drug resistance. Colonization on both biotic and abiotic surfaces, along with travel, appear to be the major factors for the spread of this pathogen across the globe. In this investigation, we present laboratory findings from an ongoing C. auris outbreak in NY from August 2016 through 2018. A total of 540 clinical isolates, 11,035 patient surveillance specimens, and 3,672 environmental surveillance samples were analyzed. Laboratory methods included matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) for yeast isolate identification, real-time PCR for rapid surveillance sample screening, culture on selective/non-selective media for recovery of C. auris and other yeasts from surveillance samples, antifungal susceptibility testing to determine the C. auris resistance profile, and Sanger sequencing of ribosomal genes for C. auris genotyping. Results included: a) identification and confirmation of C. auris in 413 clinical isolates and 931 patient surveillance isolates, as well as identification of 277 clinical cases and 350 colonized cases from 151 healthcare facilities including 59 hospitals, 92 nursing homes, 1 long-term acute care hospital (LTACH), and 2 hospices, b) successful utilization of an in-house developed C. auris real-time PCR assay for the rapid screening of patient and environmental surveillance samples, c) demonstration of relatively heavier colonization of C. auris in nares compared to the axilla/groin, and d) predominance of the South Asia Clade I with intrinsic resistance to fluconazole and elevated minimum inhibitory concentration (MIC) to voriconazole (81%), amphotericin B (61%), 5-FC (3%) and echinocandins (1%). These findings reflect greater regional prevalence and incidence of C. auris and the deployment of better detection tools in an unprecedented outbreak. |
Comparative genomics of the major parasitic worms (preprint)
International Helminth Genomes Consortium , Coghlan Avril , Tyagi Rahul , Cotton James A , Holroyd Nancy , Rosa Bruce A , Tsai Isheng Jason , Laetsch Dominik R , Beech Robin N , Day Tim A , Hallsworth-Pepin Kymberlie , Ke Huei-Mien , Kuo Tzu-Hao , Lee Tracy J , Martin John , Maizels Rick M , Mutowo Prudence , Ozersky Philip , Parkinson John , Reid Adam J , Rawlings Neil D , Ribeiro Diogo M , Seshadri Swapna Lakshmipuram , Stanley Eleanor , Taylor David W , Wheeler Nicolas J , Zamanian Mostafa , Zhang Xu , Allan Fiona , Allen Judith E , Asano Kazuhito , Babayan Simon A , Bah Germanus , Beasley Helen , Bennett Hayley M , Bisset Stewart A , Castillo Estela , Cook Joseph , Cooper Philip J , Cruz-Bustos Teresa , Cuéllar Carmen , Devaney Eileen , Doyle Stephen R , Eberhard Mark L , Emery Aidan , Eom Keeseon S , Gilleard John S , Gordon Daria , Harcus Yvonne , Harsha Bhavana , Hawdon John M , Hill Dolores E , Hodgkinson Jane , Horák Petr , Howe Kevin L , Huckvale Thomas , Kalbe Martin , Kaur Gaganjot , Kikuchi Taisei , Koutsovoulos Georgios , Kumar Sujai , Leach Andrew R , Lomax Jane , Makepeace Benjamin , Matthews Jacqueline B , Muro Antonio , O’Boyle Noel Michael , Olson Peter D , Osuna Antonio , Partono Felix , Pfarr Kenneth , Rinaldi Gabriel , Foronda Pilar , Rollinson David , Gomez Samblas Mercedes , Sato Hiroshi , Schnyder Manuela , Scholz Tomáš , Shafie Myriam , Tanya Vincent N , Toledo Rafael , Tracey Alan , Urban Joseph F , Wang Lian-Chen , Zarlenga Dante , Blaxter Mark L , Mitreva Makedonka , Berriman Matthew . bioRxiv 2017 236539 Parasitic nematodes (roundworms) and platyhelminths (flatworms) cause debilitating chronic infections of humans and animals, decimate crop production and are a major impediment to socioeconomic development. Here we compare the genomes of 81 nematode and platyhelminth species, including those of 76 parasites. From 1.4 million genes, we identify gene family births and hundreds of large expanded gene families at key nodes in the phylogeny that are relevant to parasitism. Examples include gene families that modulate host immune responses, enable parasite migration though host tissues or allow the parasite to feed. We use a wide-ranging in silico screen to identify and prioritise new potential drug targets and compounds for testing. We also uncover lineage-specific differences in core metabolism and in protein families historically targeted for drug development. This is the broadest comparative study to date of the genomes of parasitic and non-parasitic worms. It provides a transformative new resource for the research community to understand and combat the diseases that parasitic worms cause. |
Comparative genomics of the major parasitic worms
International Helminth Genomes Consortium , Coghlan Avril , Tyagi Rahul , Cotton James A , Holroyd Nancy , Rosa Bruce A , Tsai Isheng Jason , Laetsch Dominik R , Beech Robin N , Day Tim A , Hallsworth-Pepin Kymberlie , Ke Huei-Mien , Kuo Tzu-Hao , Lee Tracy J , Martin John , Maizels Rick M , Mutowo Prudence , Ozersky Philip , Parkinson John , Reid Adam J , Rawlings Neil D , Ribeiro Diogo M , Seshadri Swapna Lakshmipuram , Stanley Eleanor , Taylor David W , Wheeler Nicolas J , Zamanian Mostafa , Zhang Xu , Allan Fiona , Allen Judith E , Asano Kazuhito , Babayan Simon A , Bah Germanus , Beasley Helen , Bennett Hayley M , Bisset Stewart A , Castillo Estela , Cook Joseph , Cooper Philip J , Cruz-Bustos Teresa , Cuéllar Carmen , Devaney Eileen , Doyle Stephen R , Eberhard Mark L , Emery Aidan , Eom Keeseon S , Gilleard John S , Gordon Daria , Harcus Yvonne , Harsha Bhavana , Hawdon John M , Hill Dolores E , Hodgkinson Jane , Horák Petr , Howe Kevin L , Huckvale Thomas , Kalbe Martin , Kaur Gaganjot , Kikuchi Taisei , Koutsovoulos Georgios , Kumar Sujai , Leach Andrew R , Lomax Jane , Makepeace Benjamin , Matthews Jacqueline B , Muro Antonio , O’Boyle Noel Michael , Olson Peter D , Osuna Antonio , Partono Felix , Pfarr Kenneth , Rinaldi Gabriel , Foronda Pilar , Rollinson David , Gomez Samblas Mercedes , Sato Hiroshi , Schnyder Manuela , Scholz Tomáš , Shafie Myriam , Tanya Vincent N , Toledo Rafael , Tracey Alan , Urban Joseph F , Wang Lian-Chen , Zarlenga Dante , Blaxter Mark L , Mitreva Makedonka , Berriman Matthew . Nat Genet 2019 51 (1) 163-174 Parasitic nematodes (roundworms) and platyhelminths (flatworms) cause debilitating chronic infections of humans and animals, decimate crop production and are a major impediment to socioeconomic development. Here we report a broad comparative study of 81 genomes of parasitic and non-parasitic worms. We have identified gene family births and hundreds of expanded gene families at key nodes in the phylogeny that are relevant to parasitism. Examples include gene families that modulate host immune responses, enable parasite migration though host tissues or allow the parasite to feed. We reveal extensive lineage-specific differences in core metabolism and protein families historically targeted for drug development. From an in silico screen, we have identified and prioritized new potential drug targets and compounds for testing. This comparative genomics resource provides a much-needed boost for the research community to understand and combat parasitic worms. |
Chapare Hemorrhagic Fever and Virus Detection in Rodents in Bolivia in 2019.
LoayzaMafayle R , Morales-Betoulle ME , Romero C , Cossaboom CM , Whitmer S , AlvarezAguilera CE , AvilaArdaya C , CruzZambrana M , DvalosAnajia A , MendozaLoayza N , Montao AM , MoralesAlvis FL , RevolloGuzmn J , SasasMartnez S , AlarcnDeLaVega G , MedinaRamrez A , MolinaGutirrez JT , CornejoPinto AJ , SalasBacci R , Brignone J , Garcia J , Aez A , Mendez-Rico J , Luz K , Segales A , TorrezCruz KM , Valdivia-Cayoja A , Amman BR , Choi MJ , Erickson BR , Goldsmith C , Graziano JC , Joyce A , Klena JD , Leach A , Malenfant JH , Nichol ST , Patel K , Sealy T , Shoemaker T , Spiropoulou CF , Todres A , Towner JS , Montgomery JM . N Engl J Med 2022 386 (24) 2283-2294 ![]() ![]() BACKGROUND: In June 2019, the Bolivian Ministry of Health reported a cluster of cases of hemorrhagic fever that started in the municipality of Caranavi and expanded to La Paz. The cause of these cases was unknown. METHODS: We obtained samples for next-generation sequencing and virus isolation. Human and rodent specimens were tested by means of virus-specific real-time quantitative reverse-transcriptase-polymerase-chain-reaction assays, next-generation sequencing, and virus isolation. RESULTS: Nine cases of hemorrhagic fever were identified; four of the patients with this illness died. The etiologic agent was identified as Mammarenavirus Chapare mammarenavirus, or Chapare virus (CHAPV), which causes Chapare hemorrhagic fever (CHHF). Probable nosocomial transmission among health care workers was identified. Some patients with CHHF had neurologic manifestations, and those who survived had a prolonged recovery period. CHAPV RNA was detected in a variety of human body fluids (including blood; urine; nasopharyngeal, oropharyngeal, and bronchoalveolar-lavage fluid; conjunctiva; and semen) and in specimens obtained from captured small-eared pygmy rice rats (Oligoryzomys microtis). In survivors of CHHF, viral RNA was detected up to 170 days after symptom onset; CHAPV was isolated from a semen sample obtained 86 days after symptom onset. CONCLUSIONS: M. Chapare mammarenavirus was identified as the etiologic agent of CHHF. Both spillover from a zoonotic reservoir and possible person-to-person transmission were identified. This virus was detected in a rodent species, O. microtis. (Funded by the Bolivian Ministry of Health and others.). |
A Description of the First Candida auris -Colonized Individuals in New York State, 2016-2017
Southwick K , Ostrowsky B , Greenko J , Adams E , Lutterloh E , Denis RJ , Patel R , Erazo R , Fernandez R , Bucher C , Quinn M , Green C , Chaturvedi S , Leach L , Zhu Y . Am J Infect Control 2021 50 (3) 358-360 Candida auris (C. auris) is a globally-emerging multi-drug resistant yeast. New York State (NYS) first detected C. auris in July 2016 and is the state most affected. This brief report describes characteristics of the first 114 individuals colonized with C. auris identified through active surveillance/screening by NYS Department of Health (NYSDOH). "Colonized/screened" individuals were old (median age,74 year), had extensive healthcare exposures and underlying conditions (multiple healthcare facility admissions in the 90 days prior with more than 80% requiring mechanical ventilation), and had 30 and 90 day mortality rates of 17.5% and 37.7%, respectively (with approximately 60% expired in the two-year follow-up period). This description is helpful to inform additional prevention measures and add to the collective understanding of C. auris in the U.S. |
Incidence of Multisystem Inflammatory Syndrome in Children Among US Persons Infected With SARS-CoV-2.
Payne AB , Gilani Z , Godfred-Cato S , Belay ED , Feldstein LR , Patel MM , Randolph AG , Newhams M , Thomas D , Magleby R , Hsu K , Burns M , Dufort E , Maxted A , Pietrowski M , Longenberger A , Bidol S , Henderson J , Sosa L , Edmundson A , Tobin-D'Angelo M , Edison L , Heidemann S , Singh AR , Giuliano JSJr , Kleinman LC , Tarquinio KM , Walsh RF , Fitzgerald JC , Clouser KN , Gertz SJ , Carroll RW , Carroll CL , Hoots BE , Reed C , Dahlgren FS , Oster ME , Pierce TJ , Curns AT , Langley GE , Campbell AP , Balachandran N , Murray TS , Burkholder C , Brancard T , Lifshitz J , Leach D , Charpie I , Tice C , Coffin SE , Perella D , Jones K , Marohn KL , Yager PH , Fernandes ND , Flori HR , Koncicki ML , Walker KS , Di Pentima MC , Li S , Horwitz SM , Gaur S , Coffey DC , Harwayne-Gidansky I , Hymes SR , Thomas NJ , Ackerman KG , Cholette JM . JAMA Netw Open 2021 4 (6) e2116420 IMPORTANCE: Multisystem inflammatory syndrome in children (MIS-C) is associated with recent or current SARS-CoV-2 infection. Information on MIS-C incidence is limited. OBJECTIVE: To estimate population-based MIS-C incidence per 1 000 000 person-months and to estimate MIS-C incidence per 1 000 000 SARS-CoV-2 infections in persons younger than 21 years. DESIGN, SETTING, AND PARTICIPANTS: This cohort study used enhanced surveillance data to identify persons with MIS-C during April to June 2020, in 7 jurisdictions reporting to both the Centers for Disease Control and Prevention national surveillance and to Overcoming COVID-19, a multicenter MIS-C study. Denominators for population-based estimates were derived from census estimates; denominators for incidence per 1 000 000 SARS-CoV-2 infections were estimated by applying published age- and month-specific multipliers accounting for underdetection of reported COVID-19 case counts. Jurisdictions included Connecticut, Georgia, Massachusetts, Michigan, New Jersey, New York (excluding New York City), and Pennsylvania. Data analyses were conducted from August to December 2020. EXPOSURES: Race/ethnicity, sex, and age group (ie, ≤5, 6-10, 11-15, and 16-20 years). MAIN OUTCOMES AND MEASURES: Overall and stratum-specific adjusted estimated MIS-C incidence per 1 000 000 person-months and per 1 000 000 SARS-CoV-2 infections. RESULTS: In the 7 jurisdictions examined, 248 persons with MIS-C were reported (median [interquartile range] age, 8 [4-13] years; 133 [53.6%] male; 96 persons [38.7%] were Hispanic or Latino; 75 persons [30.2%] were Black). The incidence of MIS-C per 1 000 000 person-months was 5.1 (95% CI, 4.5-5.8) persons. Compared with White persons, incidence per 1 000 000 person-months was higher among Black persons (adjusted incidence rate ratio [aIRR], 9.26 [95% CI, 6.15-13.93]), Hispanic or Latino persons (aIRR, 8.92 [95% CI, 6.00-13.26]), and Asian or Pacific Islander (aIRR, 2.94 [95% CI, 1.49-5.82]) persons. MIS-C incidence per 1 000 000 SARS-CoV-2 infections was 316 (95% CI, 278-357) persons and was higher among Black (aIRR, 5.62 [95% CI, 3.68-8.60]), Hispanic or Latino (aIRR, 4.26 [95% CI, 2.85-6.38]), and Asian or Pacific Islander persons (aIRR, 2.88 [95% CI, 1.42-5.83]) compared with White persons. For both analyses, incidence was highest among children aged 5 years or younger (4.9 [95% CI, 3.7-6.6] children per 1 000 000 person-months) and children aged 6 to 10 years (6.3 [95% CI, 4.8-8.3] children per 1 000 000 person-months). CONCLUSIONS AND RELEVANCE: In this cohort study, MIS-C was a rare complication associated with SARS-CoV-2 infection. Estimates for population-based incidence and incidence among persons with infection were higher among Black, Hispanic or Latino, and Asian or Pacific Islander persons. Further study is needed to understand variability by race/ethnicity and age group. |
Identifying septic pollution exposure routes during a waterborne norovirus outbreak - A new application for human-associated microbial source tracking qPCR.
Mattioli MC , Benedict KM , Murphy J , Kahler A , Kline KE , Longenberger A , Mitchell PK , Watkins S , Berger P , Shanks OC , Barrett CE , Barclay L , Hall AJ , Hill V , Weltman A . J Microbiol Methods 2020 180 106091 ![]() ![]() In June 2017, the Pennsylvania Department of Health (PADOH) was notified of multiple norovirus outbreaks associated with 179 ill individuals who attended separate events held at an outdoor venue and campground over a month period. Epidemiologic investigations were unable to identify a single exposure route and therefore unable to determine whether there was a persistent contamination source to target for exposure mitigation. Norovirus was detected in a fresh recreational water designated swimming area and a drinking water well. A hydrogeological site evaluation suggested a nearby septic leach field as a potential contamination source via ground water infiltration. Geological characterization revealed a steep dip of the bedrock beneath the septic leach field toward the well, providing a viral transport pathway in a geologic medium not previously documented as high risk for viral ground water contamination. The human-associated microbial source tracking (MST) genetic marker, HF183, was used as a microbial tracer to demonstrate the hydrogeological connection between the malfunctioning septic system, drinking water well, and recreational water area. Based on environmental investigation findings, venue management and local public health officials implemented a series of outbreak prevention strategies including discontinuing the use of the contaminated well, issuing a permit for a new drinking water well, increasing portable toilet and handwashing station availability, and promoting proper hand hygiene. Despite the outbreaks at the venue and evidence of ground water contamination impacting nearby recreational water and the drinking water well, no new norovirus cases were reported during a large event one week after implementing prevention practices. This investigation highlights a new application for human-associated MST methods to trace hydrological connections between multiple fecal pollutant exposure routes in an outbreak scenario. In turn, pollutant source information can be used to develop effective intervention practices to mitigate exposure and prevent future outbreaks associated with human fecal contaminated waters. |
Laboratory Analysis of an Outbreak of Candida auris in New York from 2016 to 2018-Impact and Lessons Learned.
Zhu Y , O'Brien B , Leach L , Clark A , Bates M , Adams E , Ostrowsky B , Quinn M , Dufort E , Southwick K , Erazo R , Haley VB , Bucher C , Chaturvedi V , Limberger RJ , Blog D , Lutterloh E , Chaturvedi S . J Clin Microbiol 2019 58 (4) ![]() ![]() Candida auris is a multidrug-resistant yeast which has emerged in healthcare facilities worldwide, however little is known about identification methods, patient colonization, environmental survival, spread, and drug resistance. Colonization on both biotic (patients) and abiotic (healthcare objects) surfaces, along with travel, appear to be the major factors for the spread of this pathogen across the globe. In this investigation, we present laboratory findings from an ongoing C. auris outbreak in New York (NY) from August 2016 through 2018. A total of 540 clinical isolates, 11,035 patient surveillance specimens, and 3,672 environmental surveillance samples were analyzed. Laboratory methods included matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) for yeast isolate identification, real-time PCR for rapid surveillance sample screening, culture on selective/non-selective media for recovery of C. auris and other yeasts from surveillance samples, antifungal susceptibility testing to determine the C. auris resistance profile, and Sanger sequencing of the internal transcribed spacer (ITS) and D1/D2 regions of the ribosomal gene for C. auris genotyping. Results included: a) identification and confirmation of C. auris in 413 clinical isolates and 931 patient surveillance isolates, as well as identification of 277 clinical cases and 350 colonized cases from 151 healthcare facilities including 59 hospitals, 92 nursing homes, 1 long-term acute care hospital (LTACH), and 2 hospices, b) successful utilization of an in-house developed C. auris real-time PCR assay for the rapid screening of patient and environmental surveillance samples, c) demonstration of relatively heavier colonization of C. auris in nares compared to the axilla/groin, and d) predominance of the South Asia clade I with intrinsic resistance to fluconazole and elevated minimum inhibitory concentration (MIC) to voriconazole (81%), amphotericin B (61%), 5-FC (3%) and echinocandins (1%). These findings reflect greater regional prevalence and incidence of C. auris and the deployment of better detection tools in an unprecedented outbreak. |
Safety profile of the RTS,S/AS01 malaria vaccine in infants and children: additional data from a phase III randomized controlled trial in sub-Saharan Africa
Guerra Mendoza Y , Garric E , Leach A , Lievens M , Ofori-Anyinam O , Pircon JY , Stegmann JU , Vandoolaeghe P , Otieno L , Otieno W , Owusu-Agyei S , Sacarlal J , Masoud NS , Sorgho H , Tanner M , Tinto H , Valea I , Mtoro AT , Njuguna P , Oneko M , Otieno GA , Otieno K , Gesase S , Hamel MJ , Hoffman I , Kaali S , Kamthunzi P , Kremsner P , Lanaspa M , Lell B , Lusingu J , Malabeja A , Aide P , Akoo P , Ansong D , Asante KP , Berkley JA , Adjei S , Agbenyega T , Agnandji ST , Schuerman L . Hum Vaccin Immunother 2019 15 (10) 1-13 A phase III, double-blind, randomized, controlled trial (NCT00866619) in sub-Saharan Africa showed RTS,S/AS01 vaccine efficacy against malaria. We now present in-depth safety results from this study. 8922 children (enrolled at 5-17 months) and 6537 infants (enrolled at 6-12 weeks) were 1:1:1-randomized to receive 4 doses of RTS,S/AS01 (R3R) or non-malaria control vaccine (C3C), or 3 RTS,S/AS01 doses plus control (R3C). Aggregate safety data were reviewed by a multi-functional team. Severe malaria with Blantyre Coma Score </=2 (cerebral malaria [CM]) and gender-specific mortality were assessed post-hoc. Serious adverse event (SAE) and fatal SAE incidences throughout the study were 24.2%-28.4% and 1.5%-2.5%, respectively across groups; 0.0%-0.3% of participants reported vaccination-related SAEs. The incidence of febrile convulsions in children was higher during the first 2-3 days post-vaccination with RTS,S/AS01 than with control vaccine, consistent with the time window of post-vaccination febrile reactions in this study (mostly the day after vaccination). A statistically significant numerical imbalance was observed for meningitis cases in children (R3R: 11, R3C: 10, C3C: 1) but not in infants. CM cases were more frequent in RTS,S/AS01-vaccinated children (R3R: 19, R3C: 24, C3C: 10) but not in infants. All-cause mortality was higher in RTS,S/AS01-vaccinated versus control girls (2.4% vs 1.3%, all ages) in our setting with low overall mortality. The observed meningitis and CM signals are considered likely chance findings, that - given their severity - warrant further evaluation in phase IV studies and WHO-led pilot implementation programs to establish the RTS,S/AS01 benefit-risk profile in real-life settings. |
A pathway to developing and testing quality measures aimed at improving adult vaccination rates in the United States
Shen AK , Groom AV , Leach DL , Bridges CB , Tsai AY , Tan L . Vaccine 2019 37 (10) 1277-1283 Despite recommendations for vaccinating adults and widespread availability of immunization services (e.g., pharmacy venues, workplace wellness clinics), vaccination rates in the United States remain low. The U.S. National Adult Immunization Plan identified the development of quality measures as a priority and key strategy to address low adult vaccination coverage rates. The use of quality measures can provide incentives for increased utilization of preventive services. To address the lack of adult immunization measures, the National Adult and Influenza Immunization Summit, a coalition of adult immunization partners led by the Immunization Action Coalition, Centers for Disease Control and Prevention, and National Vaccine Program Office, spearheaded efforts to (1) identify gaps and priorities in adult immunization quality performance measurement; (2) explore feasibility of data collection on adult immunizations through pilot testing and engaging stakeholders; and (3) develop and test quality measure specifications. This paper outlines the process by which a public-private partnership drove the development of two adult immunization performance measures-an adult immunization status measure for influenza, tetanus and diphtheria (Td) and/or tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis (Tdap), herpes zoster and pneumococcal vaccines, and a prenatal immunization status measure for influenza and Tdap vaccinations in pregnant women. These measures have recently been added to the 2019 Healthcare Effectiveness Data and Information Set (HEDIS(R)), a widely used set of performance measures reportable by private health plans. |
Maintaining quality of candidate strains of transgenic mosquitoes for studies in containment facilities in disease endemic countries
Mumford JD , Leach AW , Benedict MQ , Facchinelli L , Quinlan MM . Vector Borne Zoonotic Dis 2018 18 (1) 31-38 Transgenic mosquitoes are being developed as novel components of area-wide approaches to vector-borne disease control. Best practice is to develop these in phases, beginning with laboratory studies, before moving to field testing and inclusion in control programs, to ensure safety and prevent costly field testing of unsuitable strains. The process of identifying and developing good candidate strains requires maintenance of transgenic colonies over many generations in containment facilities. By working in disease endemic countries with target vector populations, laboratory strains may be developed and selected for properties that will enhance intended control efficacy in the next phase, while avoiding traits that introduce unnecessary risks. Candidate strains aiming toward field use must consistently achieve established performance criteria, throughout the process of scaling up from small study colonies to production of sufficient numbers for field testing and possible open release. Maintenance of a consistent quality can be demonstrated by a set of insect quality and insectary operating indicators, measured over time at predetermined intervals. These indicators: inform comparability of studies using various candidate strains at different times and locations; provide evidence of conformity relevant to compliance with terms of approval for regulated use; and can be used to validate some assumptions related to risk assessments covering the contained phase and for release into the environment. |
Physical chemical properties and cell toxicity of sanding copper-treated lumber
Sisler JD , Qi C , McKinney W , Shaffer J , Andrew M , Lee T , Thomas T , Castranova V , Mercer RR , Qian Y . J Occup Environ Hyg 2018 15 (4) 0 To protect against decay and fungal invasion into the wood, the micronized copper, copper carbonate particles, has been applied in the wood treatment in recent years; however, there is little information on the health risk associated with sanding micronized copper- treated lumber. In this study, wood dust from the sanding of micronized copper azole -treated lumber (MCA) was compared to sanding dust from solubilized copper azole-treated wood (CA-C) and untreated yellow pine (UYP). The test found that sanding MCA released a much higher concentration of nanoparticles than sanding CA-C and UYP, and the particles between about 0.4 microm to 2 microm from sanding MCA had the highest percentage of copper. The percentage of copper in the airborne dust from sanding CA-C had a weak dependency on particle size and was lower than that from sanding MCA. Nanoparticles were seen in the MCA PM2.5 particles, while none were detected in the UYP or CA-C. Inductively coupled plasma mass spectrometry (ICP-MS) analysis found that the bulk lumber for MCA and CA-C had relatively equal copper content; however, the PM2.5 particles from sanding the MCA had a higher copper concentration when compared to the PM2.5 particles from sanding UYP or CA-C. The cellular toxicity assays show that exposure of RAW 264.7 macrophages (RAW) to MCA and CA-C wood dust suspensions did not induce cellular toxicity even at the concentration of 200 microg PM2.5 wood dust/mL. Since the copper from the treated wood dust can leach into the wood dust supernatant, the supernatants of MCA, CA-C and UYP wood dusts were subjected to the cellular toxicity assays. The data showed that at the higher concentrations of copper (>/= 5 microg/ml), both MCA and CA-C supernatants induced cellular toxicity. This study suggests that sanding MCA-treated lumber releases copper nanoparticles and both the MCA and CA-C-treated lumber can release copper, which are potentially related to the observed in vitro toxicity. |
Safety and immunogenicity of RTS,S/AS01 malaria vaccine in infants and children with WHO stage 1 or 2 HIV disease: a randomised, double-blind, controlled trial
Otieno L , Oneko M , Otieno W , Abuodha J , Owino E , Odero C , Mendoza YG , Andagalu B , Awino N , Ivinson K , Heerwegh D , Otsyula N , Oziemkowska M , Usuf EA , Otieno A , Otieno K , Leboulleux D , Leach A , Oyieko J , Slutsker L , Lievens M , Cowden J , Lapierre D , Kariuki S , Ogutu B , Vekemans J , Hamel MJ . Lancet Infect Dis 2016 16 (10) 1134-1144 BACKGROUND: Malaria remains a major global public health concern, especially in sub-Saharan Africa. The RTS,S/AS01 malaria candidate vaccine was reviewed by the European Medicines Agency and received a positive scientific opinion; WHO subsequently recommended pilot implementation in sub-Saharan African countries. Because malaria and HIV overlap geographically, HIV-infected children should be considered for RTS,S/AS01 vaccination. We therefore aimed to assess the safety of RTS,S/AS01 in HIV-infected children at two sites in western Kenya. METHODS: We did a randomised, double-blind, controlled trial at the clinical trial sites of the Kenya Medical Research Institute (KEMRI)-Walter Reed Army Institute of research in Kisumu and the KEMRI/US Centers for Disease Control and Prevention in Siaya. Eligible participants were infants and children aged from 6 weeks to 17 months with WHO stage 1 or 2 HIV disease (documented positive by DNA PCR), whether or not they were receiving antiretroviral therapy (ART). We randomly assigned participants (1:1) to receive three doses of either RTS,S/AS01 or rabies vaccine (both 0.5 mL per dose by intramuscular injection), given once per month at 0, 1, and 2 months. We did the treatment allocation using a web-based central randomisation system stratified by age (6 weeks-4 months, 5-17 months), and by baseline CD4% (<10, 10-14, 15-19, and ≥20). Data were obtained in an observer-blind manner, and the vaccine recipient, their parent or carer, the funder, and investigators responsible for the assessment of endpoints were all masked to treatment allocation (only staff responsible for the preparation and administration of the vaccines were aware of the assignment and these individuals played no other role in the study). We provided ART, even if the participants were not receiving ART before the study, and daily co-trimoxazole for prevention of opportunistic infections. The primary outcome was the occurrence of serious adverse events until 14 months after dose 1 of the vaccine, assessed in the intention-to-treat population. This trial was registered at ClinicalTrials.gov, number NCT01148459. FINDINGS: Between July 30, 2010, and May 24, 2013, we enrolled 200 children to our study and randomly assigned 99 to receive RTS,S/AS01 and 101 to receive rabies vaccine. 177 (89%) of the 200 children enrolled completed 14 months of follow-up. Serious adverse events were noted in 41 (41.4%, 95% CI 31.6-51.8) of 99 RTS,S/AS01 recipients and 37 (36.6%, 27.3-46.8) of 101 rabies-vaccine recipients (relative risk 1.1, 95% CI 0.8-1.6). 20 (20.2%, 95% CI 12.8-29.5) of 99 RTS,S/AS01 recipients and 12 (11.9%, 6.3-19.8) of 101 rabies-vaccine recipients had at least one serious adverse event within 30 days after vaccination, mainly pneumonia, febrile convulsions, and salmonella sepsis. Five (5.1%, 95% CI 1.7-11.4) of 99 RTS,S/AS01 recipients and four (4.0%, 1.1-9.8) of 101 rabies-vaccine recipients died, but no deaths were deemed related to vaccination. Mortality was associated with five cases of pneumonia (1% RTS,S/AS01 recipients vs 3% rabies-vaccine recipients), five cases of gastroenteritis (3% RTS,S/AS01 recipients vs 2% rabies-vaccine recipients), five cases of malnutrition (2% RTS,S/AS01 recipients vs 3% rabies-vaccine recipients), one case of sepsis (1% rabies-vaccine recipients), one case of Haemophilus influenza meningitis (1% rabies-vaccine recipients), and one case of tuberculosis (1% RTS,S/AS01 recipients). INTERPRETATION: RTS, S/AS01 was well tolerated when given to children with WHO clinical stage 1 or 2 HIV disease along with high antiretroviral and co-trimoxazole use. Children with HIV disease could be included in future RTS,S/AS01 vaccination programmes. FUNDING: GlaxoSmithKline Biologicals SA and PATH Malaria Vaccine Initiative. |
The US Culture Collection Network lays the foundation for progress in preservation of valuable microbial resources.
McCluskey K , Alvarez A , Bennett AR , Bokati D , Boundy-Mills K , Brown D , Bull CT , Coffey M , Dreaden T , Duke C , Dye G , Ehmke E , Eversole K , Fenstermacher K , Geiser DM , Glaeser J , Greene S , Gribble L , Griffith MP , Hanser K , Humber R , Johnson BW , Kermode A , Krichevsky M , Lauden M , Leach J , Leslie JF , May M , Melcher U , Nobles DR , Risso Fonseca N , Robinson S , Ryan M , Scott J , Silflow C , Vidaver A , Webb K , Wertz J , Yentsch S , Zehr S . Phytopathology 2016 106 (6) 532-40 ![]() The United States Culture Collection Network was formed in 2012 by a group of culture collection scientists and stakeholders in order to continue the progress established previously through efforts of an ad hoc group. The network is supported by a Research Coordination Network grant from the US National Science Foundation (NSF) and has the goals of promoting interaction among collections, encouraging the adoption of best practices, and protecting endangered or orphaned collections. After prior meetings to discuss best practices, shared data, and synergy with genome programs, the network held a meeting at the US Department of Agriculture (USDA) Agricultural Research Service (ARS) National Center for Genetic Resources Preservation (NCGRP) in Fort Collins, Colorado in October 2015 specifically to discuss collections that are vulnerable because of changes in funding programs, or are at risk of loss because of retirement or lack of funding. The meeting allowed collection curators who had already backed up their resources at the USDA NCGRP to visit the site, and brought collection owners, managers, and stakeholders together. Eight formal collections have established off-site backups with the USDA-ARS, ensuring that key material will be preserved for future research. All of the collections with backup at the NCGRP are public distributing collections including US NSF-supported genetic stock centers, USDA ARS collections, and university supported collections. Facing the retirement of several pioneering researchers, the community discussed the value of preserving personal research collections and agreed that a mechanism to preserve these valuable collections was essential to any future national culture collection system. Additional input from curators of plant and animal collections emphasized that collections of every kind face similar challenges in developing long-range plans for sustainability. |
Genetic Diversity and Protective Efficacy of the RTS,S/AS01 Malaria Vaccine.
Neafsey DE , Juraska M , Bedford T , Benkeser D , Valim C , Griggs A , Lievens M , Abdulla S , Adjei S , Agbenyega T , Agnandji ST , Aide P , Anderson S , Ansong D , Aponte JJ , Asante KP , Bejon P , Birkett AJ , Bruls M , Connolly KM , D'Alessandro U , Dobano C , Gesase S , Greenwood B , Grimsby J , Tinto H , Hamel MJ , Hoffman I , Kamthunzi P , Kariuki S , Kremsner PG , Leach A , Lell B , Lennon NJ , Lusingu J , Marsh K , Martinson F , Molel JT , Moss EL , Njuguna P , Ockenhouse CF , Ragama Ogutu B , Otieno W , Otieno L , Otieno K , Owusu-Agyei S , Park DJ , Pellé K , Robbins D , Russ C , Ryan EM , Sacarlal J , Sogoloff B , Sorgho H , Tanner M , Theander T , Valea I , Volkman SK , Yu Q , Lapierre D , Birren BW , Gilbert PB , Wirth DF . N Engl J Med 2015 373 (21) 2025-2037 ![]() BACKGROUND: The RTS,S/AS01 vaccine targets the circumsporozoite protein of Plasmodium falciparum and has partial protective efficacy against clinical and severe malaria disease in infants and children. We investigated whether the vaccine efficacy was specific to certain parasite genotypes at the circumsporozoite protein locus. METHODS: We used polymerase chain reaction-based next-generation sequencing of DNA extracted from samples from 4985 participants to survey circumsporozoite protein polymorphisms. We evaluated the effect that polymorphic positions and haplotypic regions within the circumsporozoite protein had on vaccine efficacy against first episodes of clinical malaria within 1 year after vaccination. RESULTS: In the per-protocol group of 4577 RTS,S/AS01-vaccinated participants and 2335 control-vaccinated participants who were 5 to 17 months of age, the 1-year cumulative vaccine efficacy was 50.3% (95% confidence interval [CI], 34.6 to 62.3) against clinical malaria in which parasites matched the vaccine in the entire circumsporozoite protein C-terminal (139 infections), as compared with 33.4% (95% CI, 29.3 to 37.2) against mismatched malaria (1951 infections) (P=0.04 for differential vaccine efficacy). The vaccine efficacy based on the hazard ratio was 62.7% (95% CI, 51.6 to 71.3) against matched infections versus 54.2% (95% CI, 49.9 to 58.1) against mismatched infections (P=0.06). In the group of infants 6 to 12 weeks of age, there was no evidence of differential allele-specific vaccine efficacy. CONCLUSIONS: These results suggest that among children 5 to 17 months of age, the RTS,S vaccine has greater activity against malaria parasites with the matched circumsporozoite protein allele than against mismatched malaria. The overall vaccine efficacy in this age category will depend on the proportion of matched alleles in the local parasite population; in this trial, less than 10% of parasites had matched alleles. (Funded by the National Institutes of Health and others.). |
An action plan for translating cancer survivorship research into care.
Alfano CM , Smith T , de Moor JS , Glasgow RE , Khoury MJ , Hawkins NA , Stein KD , Rechis R , Parry C , Leach CR , Padgett L , Rowland JH . J Natl Cancer Inst 2014 106 (11) ![]() To meet the complex needs of a growing number of cancer survivors, it is essential to accelerate the translation of survivorship research into evidence-based interventions and, as appropriate, recommendations for care that may be implemented in a wide variety of settings. Current progress in translating research into care is stymied, with results of many studies un- or underutilized. To better understand this problem and identify strategies to encourage the translation of survivorship research findings into practice, four agencies (American Cancer Society, Centers for Disease Control and Prevention, LIVE STRONG: Foundation, National Cancer Institute) hosted a meeting in June, 2012, titled: "Biennial Cancer Survivorship Research Conference: Translating Science to Care." Meeting participants concluded that accelerating science into care will require a coordinated, collaborative effort by individuals from diverse settings, including researchers and clinicians, survivors and families, public health professionals, and policy makers. This commentary describes an approach stemming from that meeting to facilitate translating research into care by changing the process of conducting research-improving communication, collaboration, evaluation, and feedback through true and ongoing partnerships. We apply the T0-T4 translational process model to survivorship research and provide illustrations of its use. The resultant framework is intended to orient stakeholders to the role of their work in the translational process and facilitate the transdisciplinary collaboration needed to translate basic discoveries into best practices regarding clinical care, self-care/management, and community programs for cancer survivors. Finally, we discuss barriers to implementing translational survivorship science identified at the meeting, along with future directions to accelerate this process. |
Association between alcohol and cardiovascular disease: Mendelian randomisation analysis based on individual participant data.
Holmes MV , Dale CE , Zuccolo L , Silverwood RJ , Guo Y , Ye Z , Prieto-Merino D , Dehghan A , Trompet S , Wong A , Cavadino A , Drogan D , Padmanabhan S , Li S , Yesupriya A , Leusink M , Sundstrom J , Hubacek JA , Pikhart H , Swerdlow DI , Panayiotou AG , Borinskaya SA , Finan C , Shah S , Kuchenbaecker KB , Shah T , Engmann J , Folkersen L , Eriksson P , Ricceri F , Melander O , Sacerdote C , Gamble DM , Rayaprolu S , Ross OA , McLachlan S , Vikhireva O , Sluijs I , Scott RA , Adamkova V , Flicker L , Bockxmeer FM , Power C , Marques-Vidal P , Meade T , Marmot MG , Ferro JM , Paulos-Pinheiro S , Humphries SE , Talmud PJ , Mateo Leach I , Verweij N , Linneberg A , Skaaby T , Doevendans PA , Cramer MJ , Harst Pv , Klungel OH , Dowling NF , Dominiczak AF , Kumari M , Nicolaides AN , Weikert C , Boeing H , Ebrahim S , Gaunt TR , Price JF , Lannfelt L , Peasey A , Kubinova R , Pajak A , Malyutina S , Voevoda MI , Tamosiunas A , Maitland-van der Zee AH , Norman PE , Hankey GJ , Bergmann MM , Hofman A , Franco OH , Cooper J , Palmen J , Spiering W , Jong PA , Kuh D , Hardy R , Uitterlinden AG , Ikram MA , Ford I , Hypponen E , Almeida OP , Wareham NJ , Khaw KT , Hamsten A , Husemoen LL , Tjonneland A , Tolstrup JS , Rimm E , Beulens JW , Verschuren WM , Onland-Moret NC , Hofker MH , Wannamethee SG , Whincup PH , Morris R , Vicente AM , Watkins H , Farrall M , Jukema JW , Meschia J , Cupples LA , Sharp SJ , Fornage M , Kooperberg C , LaCroix AZ , Dai JY , Lanktree MB , Siscovick DS , Jorgenson E , Spring B , Coresh J , Li YR , Buxbaum SG , Schreiner PJ , Ellison RC , Tsai MY , Patel SR , Redline S , Johnson AD , Hoogeveen RC , Hakonarson H , Rotter JI , Boerwinkle E , Bakker PI , Kivimaki M , Asselbergs FW , Sattar N , Lawlor DA , Whittaker J , Davey Smith G , Mukamal K , Psaty BM , Wilson JG , Lange LA , Hamidovic A , Hingorani AD , Nordestgaard BG , Bobak M , Leon DA , Langenberg C , Palmer TM , Reiner AP , Keating BJ , Dudbridge F , Casas JP . BMJ 2014 349 g4164 ![]() OBJECTIVE: To use the rs1229984 variant in the alcohol dehydrogenase 1B gene (ADH1B) as an instrument to investigate the causal role of alcohol in cardiovascular disease. DESIGN: Mendelian randomisation meta-analysis of 56 epidemiological studies. PARTICIPANTS: 261 991 individuals of European descent, including 20 259 coronary heart disease cases and 10 164 stroke events. Data were available on ADH1B rs1229984 variant, alcohol phenotypes, and cardiovascular biomarkers. MAIN OUTCOME MEASURES: Odds ratio for coronary heart disease and stroke associated with the ADH1B variant in all individuals and by categories of alcohol consumption. RESULTS: Carriers of the A-allele of ADH1B rs1229984 consumed 17.2% fewer units of alcohol per week (95% confidence interval 15.6% to 18.9%), had a lower prevalence of binge drinking (odds ratio 0.78 (95% CI 0.73 to 0.84)), and had higher abstention (odds ratio 1.27 (1.21 to 1.34)) than non-carriers. Rs1229984 A-allele carriers had lower systolic blood pressure (-0.88 (-1.19 to -0.56) mm Hg), interleukin-6 levels (-5.2% (-7.8 to -2.4%)), waist circumference (-0.3 (-0.6 to -0.1) cm), and body mass index (-0.17 (-0.24 to -0.10) kg/m(2)). Rs1229984 A-allele carriers had lower odds of coronary heart disease (odds ratio 0.90 (0.84 to 0.96)). The protective association of the ADH1B rs1229984 A-allele variant remained the same across all categories of alcohol consumption (P=0.83 for heterogeneity). Although no association of rs1229984 was identified with the combined subtypes of stroke, carriers of the A-allele had lower odds of ischaemic stroke (odds ratio 0.83 (0.72 to 0.95)). CONCLUSIONS: Individuals with a genetic variant associated with non-drinking and lower alcohol consumption had a more favourable cardiovascular profile and a reduced risk of coronary heart disease than those without the genetic variant. This suggests that reduction of alcohol consumption, even for light to moderate drinkers, is beneficial for cardiovascular health. |
Longitudinal nasopharyngeal carriage and antibiotic resistance of respiratory bacteria in indigenous Australian and alaska native children with bronchiectasis
Hare KM , Singleton RJ , Grimwood K , Valery PC , Cheng AC , Morris PS , Leach AJ , Smith-Vaughan HC , Chatfield M , Redding G , Reasonover AL , McCallum GB , Chikoyak L , McDonald MI , Brown N , Torzillo PJ , Chang AB . PLoS One 2013 8 (8) e70478 BACKGROUND: Indigenous children in Australia and Alaska have very high rates of chronic suppurative lung disease (CSLD)/bronchiectasis. Antibiotics, including frequent or long-term azithromycin in Australia and short-term beta-lactam therapy in both countries, are often prescribed to treat these patients. In the Bronchiectasis Observational Study we examined over several years the nasopharyngeal carriage and antibiotic resistance of respiratory bacteria in these two PCV7-vaccinated populations. METHODS: Indigenous children aged 0.5-8.9 years with CSLD/bronchiectasis from remote Australia (n = 79) and Alaska (n = 41) were enrolled in a prospective cohort study during 2004-8. At scheduled study visits until 2010 antibiotic use in the preceding 2-weeks was recorded and nasopharyngeal swabs collected for culture and antimicrobial susceptibility testing. Analysis of respiratory bacterial carriage and antibiotic resistance was by baseline and final swabs, and total swabs by year. RESULTS: Streptococcus pneumoniae carriage changed little over time. In contrast, carriage of Haemophilus influenzae declined and Staphylococcus aureus increased (from 0% in 2005-6 to 23% in 2010 in Alaskan children); these changes were associated with increasing age. Moraxella catarrhalis carriage declined significantly in Australian, but not Alaskan, children (from 64% in 2004-6 to 11% in 2010). While beta-lactam antibiotic use was similar in the two cohorts, Australian children received more azithromycin. Macrolide resistance was significantly higher in Australian compared to Alaskan children, while H. influenzae beta-lactam resistance was higher in Alaskan children. Azithromycin use coincided significantly with reduced carriage of S. pneumoniae, H. influenzae and M. catarrhalis, but increased carriage of S. aureus and macrolide-resistant strains of S. pneumoniae and S. aureus (proportion of carriers and all swabs), in a 'cumulative dose-response' relationship. CONCLUSIONS: Over time, similar (possibly age-related) changes in nasopharyngeal bacterial carriage were observed in Australian and Alaskan children with CSLD/bronchiectasis. However, there were also significant frequency-dependent differences in carriage and antibiotic resistance that coincided with azithromycin use. |
Human pathogens on plants: designing a multidisciplinary strategy for research
Fletcher J , Leach JE , Eversole K , Tauxe R . Phytopathology 2013 103 (4) 306-15 Recent efforts to address concerns about microbial contamination of food plants and resulting foodborne illness have prompted new collaboration and interactions between the scientific communities of plant pathology and food safety. This article provides perspectives from scientists of both disciplines and presents selected research results and concepts that highlight existing and possible future synergisms for audiences of both disciplines. Plant pathology is a complex discipline that encompasses studies of the dissemination, colonization, and infection of plants by microbes such as bacteria, viruses, fungi, and oomycetes. Plant pathologists study plant diseases as well as host plant defense responses and disease management strategies with the goal of minimizing disease occurrences and impacts. Repeated outbreaks of human illness attributed to the contamination of fresh produce, nuts and seeds, and other plant-derived foods by human enteric pathogens such as Shiga toxin-producing Escherichia coli and Salmonella spp. have led some plant pathologists to broaden the application of their science in the past two decades, to address problems of human pathogens on plants (HPOPs). Food microbiology, which began with the study of microbes that spoil foods and those that are critical to produce food, now also focuses study on how foods become contaminated with pathogens and how this can be controlled or prevented. Thus, at the same time, public health researchers and food microbiologists have become more concerned about plant-microbe interactions before and after harvest. New collaborations are forming between members of the plant pathology and food safety communities, leading to enhanced research capacity and greater understanding of the issues for which research is needed. The two communities use somewhat different vocabularies and conceptual models. For example, traditional plant pathology concepts such as the disease triangle and the disease cycle can help to define cross-over issues that pertain also to HPOP research, and can suggest logical strategies for minimizing the risk of microbial contamination. Continued interactions and communication among these two disciplinary communities is essential and can be achieved by the creation of an interdisciplinary research coordination network. We hope that this article, an introduction to the multidisciplinary HPOP arena, will be useful to researchers in many related fields. |
A phase 3 trial of RTS,S/AS01 malaria vaccine in African infants
Agnandji ST , Lell B , Fernandes JF , Abossolo BP , Methogo BG , Kabwende AL , Adegnika AA , Mordmüller B , Issifou S , Kremsner PG , Sacarlal J , Aide P , Lanaspa M , Aponte JJ , Machevo S , Acacio S , Bulo H , Sigauque B , Macete E , Alonso P , Abdulla S , Salim N , Minja R , Mpina M , Ahmed S , Ali AM , Mtoro AT , Hamad AS , Mutani P , Tanner M , Tinto H , D'Alessandro U , Sorgho H , Valea I , Bihoun B , Guiraud I , Kaboré B , Sombié O , Guiguemdé RT , Ouédraogo JB , Hamel MJ , Kariuki S , Oneko M , Odero C , Otieno K , Awino N , McMorrow M , Muturi-Kioi V , Laserson KF , Slutsker L , Otieno W , Otieno L , Otsyula N , Gondi S , Otieno A , Owira V , Oguk E , Odongo G , Woods JB , Ogutu B , Njuguna P , Chilengi R , Akoo P , Kerubo C , Maingi C , Lang T , Olotu A , Bejon P , Marsh K , Mwambingu G , Owusu-Agyei S , Asante KP , Osei-Kwakye K , Boahen O , Dosoo D , Asante I , Adjei G , Kwara E , Chandramohan D , Greenwood B , Lusingu J , Gesase S , Malabeja A , Abdul O , Mahende C , Liheluka E , Malle L , Lemnge M , Theander TG , Drakeley C , Ansong D , Agbenyega T , Adjei S , Boateng HO , Rettig T , Bawa J , Sylverken J , Sambian D , Sarfo A , Agyekum A , Martinson F , Hoffman I , Mvalo T , Kamthunzi P , Nkomo R , Tembo T , Tegha G , Tsidya M , Kilembe J , Chawinga C , Ballou WR , Cohen J , Guerra Y , Jongert E , Lapierre D , Leach A , Lievens M , Ofori-Anyinam O , Olivier A , Vekemans J , Carter T , Kaslow D , Leboulleux D , Loucq C , Radford A , Savarese B , Schellenberg D , Sillman M , Vansadia P . N Engl J Med 2012 367 (24) 2284-95 BACKGROUND: The candidate malaria vaccine RTS,S/AS01 reduced episodes of both clinical and severe malaria in children 5 to 17 months of age by approximately 50% in an ongoing phase 3 trial. We studied infants 6 to 12 weeks of age recruited for the same trial. METHODS: We administered RTS,S/AS01 or a comparator vaccine to 6537 infants who were 6 to 12 weeks of age at the time of the first vaccination in conjunction with Expanded Program on Immunization (EPI) vaccines in a three-dose monthly schedule. Vaccine efficacy against the first or only episode of clinical malaria during the 12 months after vaccination, a coprimary end point, was analyzed with the use of Cox regression. Vaccine efficacy against all malaria episodes, vaccine efficacy against severe malaria, safety, and immunogenicity were also assessed. RESULTS: The incidence of the first or only episode of clinical malaria in the intention-to-treat population during the 14 months after the first dose of vaccine was 0.31 per person-year in the RTS,S/AS01 group and 0.40 per person-year in the control group, for a vaccine efficacy of 30.1% (95% confidence interval [CI], 23.6 to 36.1). Vaccine efficacy in the per-protocol population was 31.3% (97.5% CI, 23.6 to 38.3). Vaccine efficacy against severe malaria was 26.0% (95% CI, -7.4 to 48.6) in the intention-to-treat population and 36.6% (95% CI, 4.6 to 57.7) in the per-protocol population. Serious adverse events occurred with a similar frequency in the two study groups. One month after administration of the third dose of RTS,S/AS01, 99.7% of children were positive for anti-circumsporozoite antibodies, with a geometric mean titer of 209 EU per milliliter (95% CI, 197 to 222). CONCLUSIONS: The RTS,S/AS01 vaccine coadministered with EPI vaccines provided modest protection against both clinical and severe malaria in young infants. (Funded by GlaxoSmithKline Biologicals and the PATH Malaria Vaccine Initiative; RTS,S ClinicalTrials.gov number: NCT00866619.). |
Physician over-recommendation of mammography for terminally ill women
Leach CR , Klabunde CN , Alfano CM , Smith JL , Rowland JH . Cancer 2012 118 (1) 27-37 BACKGROUND: There has been recent, sometimes intense, debate about when to begin screening and how often to screen women for breast cancer with mammography. However, there should be no controversy regarding screening women who are unlikely to benefit from the procedure, such as those with a serious, life-limiting illness who would not live long enough to benefit from the potential detection and treatment of breast cancer. Identifying characteristics of physicians who recommend mammography for terminally ill women can help guide efforts to minimize patient risks and make better use of health care resources. METHODS: The authors used data from a nationally representative survey of primary care physicians (PCPs) (N = 1196; response rate, 67.5%) conducted in 2006 and 2007 to examine PCPs' breast cancer screening recommendations for hypothetical patients ages 50 years, 65 years, and 80 years who were healthy, had a moderate comorbidity, or had a terminal comorbidity. RESULTS: Many PCPs (47.7%) reported that they would recommend mammography to a woman aged 50 years, 65 years, or 80 years with terminal lung cancer, indicating over-recommendation. Physician characteristics associated with over-recommending mammography included obstetrician/gynecologist (odds ratio [OR], 1.69) or internal medicine (OR, 0.45) specialty, being a woman (OR, 1.40), being a racial/ethnic minority (OR, 1.72), and working in a smaller practice (OR, 1.41). CONCLUSIONS: The current results indicated that physician over-recommendation of screening mammography among terminally ill women is common. Certain physician and practice characteristics, including specialty, were associated with over-recommending mammography. The authors concluded that an informed and shared mammography decision-making process for terminally ill women may eliminate unnecessary patient risks and health care expenditures. (Cancer 2012;. (c) 2011 American Cancer Society.) |
First results of phase 3 trial of RTS,S/AS01 malaria vaccine in African children
Agnandji ST , Lell B , Soulanoudjingar SS , Fernandes JF , Abossolo BP , Conzelmann C , Methogo BG , Doucka Y , Flamen A , Mordmüller B , Issifou S , Kremsner PG , Sacarlal J , Aide P , Lanaspa M , Aponte JJ , Nhamuave A , Quelhas D , Bassat Q , Mandjate S , Macete E , Alonso P , Abdulla S , Salim N , Juma O , Shomari M , Shubis K , Machera F , Hamad AS , Minja R , Mtoro A , Sykes A , Ahmed S , Urassa AM , Ali AM , Mwangoka G , Tanner M , Tinto H , D'Alessandro U , Sorgho H , Valea I , Tahita MC , Kaboré W , Ouédraogo S , Sandrine Y , Guiguemdé RT , Ouédraogo JB , Hamel MJ , Kariuki S , Odero C , Oneko M , Otieno K , Awino N , Omoto J , Williamson J , Muturi-Kioi V , Laserson KF , Slutsker L , Otieno W , Otieno L , Nekoye O , Gondi S , Otieno A , Ogutu B , Wasuna R , Owira V , Jones D , Onyango AA , Njuguna P , Chilengi R , Akoo P , Kerubo C , Gitaka J , Maingi C , Lang T , Olotu A , Tsofa B , Bejon P , Peshu N , Marsh K , Owusu-Agyei S , Asante KP , Osei-Kwakye K , Boahen O , Ayamba S , Kayan K , Owusu-Ofori R , Dosoo D , Asante I , Adjei G , Adjei G , Chandramohan D , Greenwood B , Lusingu J , Gesase S , Malabeja A , Abdul O , Kilavo H , Mahende C , Liheluka E , Lemnge M , Theander T , Drakeley C , Ansong D , Agbenyega T , Adjei S , Boateng HO , Rettig T , Bawa J , Sylverken J , Sambian D , Agyekum A , Owusu L , Martinson F , Hoffman I , Mvalo T , Kamthunzi P , Nkomo R , Msika A , Jumbe A , Chome N , Nyakuipa D , Chintedza J , Ballou WR , Bruls M , Cohen J , Guerra Y , Jongert E , Lapierre D , Leach A , Lievens M , Ofori-Anyinam O , Vekemans J , Carter T , Leboulleux D , Loucq C , Radford A , Savarese B , Schellenberg D , Sillman M , Vansadia P . N Engl J Med 2011 365 (20) 1863-75 BACKGROUND: An ongoing phase 3 study of the efficacy, safety, and immunogenicity of candidate malaria vaccine RTS,S/AS01 is being conducted in seven African countries. METHODS: From March 2009 through January 2011, we enrolled 15,460 children in two age categories--6 to 12 weeks of age and 5 to 17 months of age--for vaccination with either RTS,S/AS01 or a non-malaria comparator vaccine. The primary end point of the analysis was vaccine efficacy against clinical malaria during the 12 months after vaccination in the first 6000 children 5 to 17 months of age at enrollment who received all three doses of vaccine according to protocol. After 250 children had an episode of severe malaria, we evaluated vaccine efficacy against severe malaria in both age categories. RESULTS: In the 14 months after the first dose of vaccine, the incidence of first episodes of clinical malaria in the first 6000 children in the older age category was 0.32 episodes per person-year in the RTS,S/AS01 group and 0.55 episodes per person-year in the control group, for an efficacy of 50.4% (95% confidence interval [CI], 45.8 to 54.6) in the intention-to-treat population and 55.8% (97.5% CI, 50.6 to 60.4) in the per-protocol population. Vaccine efficacy against severe malaria was 45.1% (95% CI, 23.8 to 60.5) in the intention-to-treat population and 47.3% (95% CI, 22.4 to 64.2) in the per-protocol population. Vaccine efficacy against severe malaria in the combined age categories was 34.8% (95% CI, 16.2 to 49.2) in the per-protocol population during an average follow-up of 11 months. Serious adverse events occurred with a similar frequency in the two study groups. Among children in the older age category, the rate of generalized convulsive seizures after RTS,S/AS01 vaccination was 1.04 per 1000 doses (95% CI, 0.62 to 1.64). CONCLUSIONS: The RTS,S/AS01 vaccine provided protection against both clinical and severe malaria in African children. (Funded by GlaxoSmithKline Biologicals and the PATH Malaria Vaccine Initiative; RTS,S ClinicalTrials.gov number, NCT00866619 .) |
Statistical methodology for the evaluation of vaccine efficacy in a phase III multi-centre trial of the RTS,S/AS01 malaria vaccine in African children
Lievens M , Aponte JJ , Williamson J , Mmbando B , Mohamed A , Bejon P , Leach A . Malar J 2011 10 222 BACKGROUND: There has been much debate about the appropriate statistical methodology for the evaluation of malaria field studies and the challenges in interpreting data arising from these trials. METHODS: The present paper describes, for a pivotal phase III efficacy of the RTS, S/AS01 malaria vaccine, the methods of the statistical analysis and the rationale for their selection. The methods used to estimate efficacy of the primary course of vaccination, and of a booster dose, in preventing clinical episodes of uncomplicated and severe malaria, and to determine the duration of protection, are described. The interpretation of various measures of efficacy in terms of the potential public health impact of the vaccine is discussed. CONCLUSIONS: The methodology selected to analyse the clinical trial must be scientifically sound, acceptable to regulatory authorities and meaningful to those responsible for malaria control and public health policy. TRIAL REGISTRATION: Clinicaltrials.gov NCT00866619. |
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