Last data update: May 06, 2024. (Total: 46732 publications since 2009)
Records 1-6 (of 6 Records) |
Query Trace: Yaffee AQ[original query] |
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Multispecies Outbreak of Verona Integron-Encoded Metallo-ß-Lactamase-Producing Multidrugresistant Bacteria Driven by a Promiscuous Incompatibility Group A/C2.
de Man TJB , Yaffee AQ , Zhu W , Batra D , Alyanak E , Rowe LA , McAllister G , Moulton-Meissner H , Boyd S , Flinchum A , Slayton RB , Hancock S , Spalding Walters M , Laufer Halpin A , Rasheed JK , Noble-Wang J , Kallen AJ , Limbago BM . Clin Infect Dis 2020 72 (3) 414-420 BACKGROUND: Antibiotic resistance is often spread through bacterial populations via conjugative plasmids. However, plasmid transfer is not well recognized in clinical settings because of technical limitations, and health care-associated infections are usually caused by clonal transmission of a single pathogen. In 2015, multiple species of carbapenem-resistant Enterobacteriaceae (CRE), all producing a rare carbapenemase, were identified among patients in an intensive care unit. This observation suggested a large, previously unrecognized plasmid transmission chain and prompted our investigation. METHODS: Electronic medical record reviews, infection control observations, and environmental sampling completed the epidemiologic outbreak investigation. A laboratory analysis, conducted on patient and environmental isolates, included long-read whole-genome sequencing to fully elucidate plasmid DNA structures. Bioinformatics analyses were applied to infer plasmid transmission chains and results were subsequently confirmed using plasmid conjugation experiments. RESULTS: We identified 14 Verona integron-encoded metallo-ss-lactamase (VIM)-producing CRE in 12 patients, and 1 additional isolate was obtained from a patient room sink drain. Whole-genome sequencing identified the horizontal transfer of blaVIM-1, a rare carbapenem resistance mechanism in the United States, via a promiscuous incompatibility group A/C2 plasmid that spread among 5 bacterial species isolated from patients and the environment. CONCLUSIONS: This investigation represents the largest known outbreak of VIM-producing CRE in the United States to date, which comprises numerous bacterial species and strains. We present evidence of in-hospital plasmid transmission, as well as environmental contamination. Our findings demonstrate the potential for 2 types of hospital-acquired infection outbreaks: those due to clonal expansion and those due to the spread of conjugative plasmids encoding antibiotic resistance across species. |
Collaborative response to arsenic-contaminated soil in an Appalachian Kentucky neighborhood
Yaffee AQ , Scott B , Kaelin C , Cambron J , Sanderson W , Christian WJ , Moran TP , Chamness J . J Toxicol Environ Health A 2019 82 (12) 1-5 The aim of this study was to identify factors associated with an increased exposure to arsenic-contaminated soil in a Kentucky neighborhood as part of collaborative public health response. An exposure assessment survey was administered to residents and toenail clippings and soil samples analyzed for arsenic concentration. The associations between exposure variables and arsenic concentrations were evaluated using a multivariate-generalized estimating equation. An ecological assessment of cancer incidence in the community was also conducted using standardized incidence ratio maps. Median toenail arsenic was 0.48 micrograms/gram (microg/g), twice the expected regional level of 0.2 microg/g. Mean residence surface soil arsenic level was 64.8 ppm. An increase of 1 ppm of residence concentration was significantly associated with a 0.003 microg/g rise in toenail levels. Concentrations for respondents who engaged in digging were 0.68 microg/g significantly higher compared to individuals who did not. No significantly elevated rates of lung or bladder cancer were observed in the affected ZIP codes. Living in areas with high soil arsenic contamination might lead to (1) increased exposure; (2) elevated residence soil arsenic concentrations and (3) the action of digging in the soil was associated with elevated toenail arsenic levels. Based upon elevated soil levels identified, residents were recommended to move from the contaminated environment until remediation was complete. Additional recommendations included regular health-care follow-up. |
Notes from the field: Investigation of carbapenemase-producing carbapenem-resistant Enterobacteriaceae among patients at a community hospital - Kentucky, 2016
Chae SR , Yaffee AQ , Weng MK , Ham DC , Daniels K , Wilburn AB , Porter KA , Flinchum AH , Boyd S , Shams A , Walters MS , Kallen A . MMWR Morb Mortal Wkly Rep 2018 66 (5152) 1410 Carbapenemase-producing carbapenem-resistant Enterobacteriaceae (CP-CRE) express plasmid-encoded carbapenemases, enzymes that inactivate carbapenem antibiotics. They have the potential for epidemic spread through person-to-person transmission and horizontal transfer of resistance mechanisms (1,2). Typically, CP-CRE are associated with health care exposure. Clinical CRE infections can have mortality rates as high as 50% (3); however, the majority of CRE patients are asymptomatic. These asymptomatic colonized patients can serve as a source for transmission to other patients (4). |
Notes from the field: Obstetric tetanus in an unvaccinated woman after a home birth delivery - Kentucky, 2016
Yaffee AQ , Day DL , Bastin G , Powell M , Melendez S , Allen N , Miracle J , Jones M , Brawley R . MMWR Morb Mortal Wkly Rep 2017 66 (11) 307-308 On July 11, 2016, state and local health departments in Kentucky were notified of a case of obstetric tetanus in an unvaccinated woman. Obstetric tetanus, which occurs during pregnancy or within 6 weeks of the end of pregnancy, follows contamination of wounds with Clostridium tetani spores during pregnancy, or the use of contaminated tools or practices during nonsterile deliveries or abortions. CDC did not identify any cases of obstetric tetanus in the United States during 1972–2008 (1,2). State and local health departments in Kentucky investigated this case to identify risk factors and provide recommendations. | The patient, a woman aged 30 years, is a member of an Amish community. In late June, she delivered a child at home, assisted by an unlicensed community childbirth assistant. She had never received a vaccination for tetanus. Delivery was complicated by breech presentation, but no birth trauma, unsterile conditions, or other complications were reported. Nine days postpartum, the patient experienced facial numbness and neck pain, which progressed over 24 hours to stiff neck and jaw and difficulty swallowing and breathing. She was admitted to the hospital where a clinical diagnosis of tetanus was made, and 6,000 international units of tetanus immunoglobulin were administered intramuscularly. Endotracheal intubation and mechanical ventilation were required. Her hospital course was complicated by seizures and a need for prolonged respiratory support. After approximately a month, the patient was stable and discharged home. |
Notes from the field: Verona integron-encoded metallo-beta-lactamase-producing Carbapenem-resistant Enterobacteriaceae in a neonatal and adult intensive care unit - Kentucky, 2015
Yaffee AQ , Roser L , Daniels K , Humbaugh K , Brawley R , Thoroughman D , Flinchum A . MMWR Morb Mortal Wkly Rep 2016 65 (7) 190 During August 4-September 1, 2015, eight cases of Verona integron-encoded metallo-beta-lactamase (VIM)-producing Carbapenem-resistant Enterobacteriaceae (CRE) colonization were identified in six patients, using weekly active surveillance perirectal cultures in a Kentucky tertiary care hospital. No cases of clinical infection or complications attributable to colonization were reported. Four of the eight isolates were identified as Enterobacter cloacae; other organisms included Raoultella species (one), Escherichia coli (one), and Klebsiella pneumoniae (two). Six isolates were reported in a neonatal intensive care unit (ICU), and two isolates in an adult trauma and surgical ICU. Patient ages at isolate culture date ranged from 21 days to 68 years. Fifty percent of the patients were male. Previously, only one VIM-producing CRE-colonized patient (an adult, in 2013) had been reported by the same hospital. The six cases are the largest occurrence of VIM-producing CRE colonization reported in the United States and the only recognized cluster of VIM-producing CRE colonization in the United States reported to include a neonatal population. Despite environmental sampling over the same period, surveying patients for exposure to health care outside the United States, surveying health care providers for risk factors, and surveillance culturing of health care provider nares and axillae, a source of VIM-producing CRE has not been identified for this cluster. Prevention measures throughout the ICUs have been enhanced in response to this cluster, as detailed in CDC's 2015 CRE toolkit update. |
Outbreak of Shiga toxin-producing Escherichia coli (STEC) O157:H7 associated with romaine lettuce consumption, 2011
Slayton RB , Turabelidze G , Bennett SD , Schwensohn CA , Yaffee AQ , Khan F , Butler C , Trees E , Ayers TL , Davis ML , Laufer AS , Gladbach S , Williams I , Gieraltowski LB . PLoS One 2013 8 (2) e55300 BACKGROUND: Shiga toxin-producing Escherichia coli (STEC) O157:H7 is the causal agent for more than 96,000 cases of diarrheal illness and 3,200 infection-attributable hospitalizations annually in the United States. MATERIALS AND METHODS: We defined a confirmed case as a compatible illness in a person with the outbreak strain during 10/07/2011-11/30/2011. Investigation included hypothesis generation, a case-control study utilizing geographically-matched controls, and a case series investigation. Environmental inspections and tracebacks were conducted. RESULTS: We identified 58 cases in 10 states; 67% were hospitalized and 6.4% developed hemolytic uremic syndrome. Any romaine consumption was significantly associated with illness (matched Odds Ratio (mOR) = 10.0, 95% Confidence Interval (CI) = 2.1-97.0). Grocery Store Chain A salad bar was significantly associated with illness (mOR = 18.9, 95% CI = 4.5-176.8). Two separate traceback investigations for romaine lettuce converged on Farm A. Case series results indicate that cases (64.9%) were more likely than the FoodNet population (47%) to eat romaine lettuce (p-value = 0.013); 61.3% of cases reported consuming romaine lettuce from the Grocery Store Chain A salad bar. CONCLUSIONS: This multistate outbreak of STEC O157:H7 infections was associated with consumption of romaine lettuce. Traceback analysis determined that a single common lot of romaine lettuce harvested from Farm A was used to supply Grocery Store Chain A and a university campus linked to a case with the outbreak strain. An investigation at Farm A did not identify the source of contamination. Improved ability to trace produce from the growing fields to the point of consumption will allow more timely prevention and control measures to be implemented. |
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