Last data update: May 06, 2024. (Total: 46732 publications since 2009)
Records 1-4 (of 4 Records) |
Query Trace: Cohen Adam L[original query] |
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The present and future of the adult pneumococcal vaccine program in the United States
Miwako Kobayashi , Cohen Adam L , Poehling Katherine A . NEJM Evidence 2023 2 (11) 11-11 Streptococcus pneumoniae (pneumococcus) is a common cause of bacterial respiratory infections, such as pneumonia, sinusitis, and acute otitis media, and it also causes invasive diseases (i.e., infection in a normally sterile site), such as meningitis and bacteremia, leading to substantial morbidity and mortality. Before the coronavirus disease 2019 (Covid-19) pandemic, it is estimated that ≥100,000 pneumococcal pneumonia hospitalizations, ≥30,000 invasive pneumococcal disease cases, and 3000 invasive pneumocococcal disease deaths occurred among U.S. adults in a year.1 Resurgence of non-SARS-CoV-2 respiratory virus infections was reported in the United States in late 2022, and preliminary invasive pneumocococcal disease incidence in late 2022 exceeded the pre--Covid-19 baseline incidence in children and young adults (Centers for Disease Control and Prevention Active Bacterial Core surveillance, unpublished data). Effective pneumococcal vaccines are available and have been used in many countries. Although children have been the focus of pneumococcal vaccination programs globally,2 pneumococcal vaccines have also been recommended for adults in the United States for more than 40 years. The Advisory Committee on Immunization Practices updated their adult pneumococcal vaccine recommendations in October 2022, the fifth time since 2012 (Table 1), with the goal of increasing population-level protection against pneumococcal disease as well as reducing disparities in pneumococcal disease burden among those at increased risk.3 What have we learned from the U.S. adult pneumococcal vaccine program, what are the remaining gaps, and how can we address these gaps in considering future U.S. pneumococcal vaccine recommendations? Adult Pneumococcal Vaccine Program in the United States Streptococcus pneumoniae (pneumococcus) is a common cause of bacterial respiratory infections leading to substantial morbidity and mortality. Here, Kobayashi et al. discuss the recently updated U.S. guidelines for adult pneumococcal vaccination. |
Vaccines work: a reason for celebration and renewed commitment.
Cohen AL , Patel MK , Cherian T . Lancet 2021 397 (10272) 351-353 With policy makers around the world considering how to allocate limited health budgets and individuals considering whether to accept vaccinations for themselves and their children, understanding the impact of vaccination has never been more important to inform those decisions. A modelling study by Xiang Li and colleagues in The Lancet reports that vaccination against ten common vaccine-preventable diseases (VPDs) reduced deaths by nearly half in low-income and middle-income countries between 2000 and 2019.1 Using demographic and vaccine coverage data, the authors compiled and analysed modelled VPD burden and vaccine impact estimates from 16 independent research groups. The main findings highlight the large impact of vaccination and how well the global immunisation community and caregivers have done in vaccinating children. Remarkably, this finding is likely to be an underestimate of the full impact of vaccination, and yet, at the same time, the global community is at risk of losing these gains.2 |
Replacement of neuraminidase inhibitor susceptible influenza A(H1N1) with resistant phenotype in 2008 and circulation of susceptible influenza A and B viruses during 2009-2013, South Africa.
Treurnicht FK , Buys A , Tempia S , Seleka M , Cohen AL , Walaza S , Glass AJ , Rossouw I , McAnerney J , Blumberg L , Cohen C , Venter M . Influenza Other Respir Viruses 2019 13 (1) 54-63 BACKGROUND: Data on the susceptibility of influenza viruses from South Africa to neuraminidase inhibitors (NAIs) are scarce, and no extensive analysis was done. OBJECTIVES: We aimed to determine oseltamivir and zanamivir susceptibility of influenza A and B virus neuraminidases (NAs), 2007-2013, South Africa. PATIENTS/METHODS: We enrolled participants through national influenza-like illness surveillance, 2007-2013. Influenza diagnosis was by virus isolation and quantitative polymerase chain reaction (qPCR). Drug susceptibility was determined by chemiluminescence-based NA-STAR/NA-XTD assay. Sanger sequencing was used to determine molecular markers of NAI resistance. RESULTS: Forty percent (6341/15 985) of participants were positive for influenza viruses using virus isolation (2007-2009) and qPCR (2009-2013) methods. A total of 1236/6341 (19.5%) virus isolates were generated of which 307/1236 (25%) were tested for drug susceptibility. During 2007-2008, the median 50% inhibitory concentration (IC50 ) of oseltamivir for seasonal influenza A(H1N1) increased from of 0.08 nmol/L (range 0.01-3.60) in 2007 to 73 nmol/L (range 1.56-305 nmol/L) in 2008. Influenza A isolates from 2009 to 2013 were susceptible to oseltamivir [A(H3N2) median IC50 = 0.05 nmol/L (range 0.01-0.08); A(H1N1)pdm09 = 0.11 nmol/L (range 0.01-0.78)] and zanamivir [A(H3N2) median IC50 = 0.56 nmol/L (range 0.47-0.66); A(H1N1)pdm09 = 0.35 nmol/L (range 0.27-0.533)]. Influenza B viruses were susceptible to both NAIs. NAI resistance-associated substitutions H275Y, E119V, and R150K (N1 numbering) were not detected in influenza A viruses that circulated in 2009-2013. CONCLUSIONS: We confirm replacement of NAI susceptible by resistant phenotype influenza A(H1N1) in 2008. Influenza A and B viruses (2009-2013) remained susceptible to NAIs; therefore, these drugs are useful for treating influenza-infected patients. |
Assessing the impact of pneumococcal conjugate vaccines on invasive pneumococcal disease using polymerase chain reaction-based surveillance: an experience from South Africa.
Tempia S , Wolter N , Cohen C , Walaza S , von Mollendorf C , Cohen AL , Moyes J , de Gouveia L , Nzenze S , Treurnicht F , Venter M , Groome MJ , Madhi SA , von Gottberg A . BMC Infect Dis 2015 15 450 BACKGROUND: The use of molecular diagnostic techniques for the evaluation of the impact of pneumococcal conjugate vaccines (PCVs) has not been documented. We aimed to evaluate the impact of PCVs on invasive pneumococcal disease (IPD) using polymerase chain reaction (PCR)-based techniques and compare with results obtained from culture-based methods. METHODS: We implemented two independent surveillance programs for IPD among individuals hospitalized at one large surveillance site in Soweto, South Africa during 2009-2012: (i) PCR-based (targeting the lytA gene) syndromic pneumonia surveillance; and (ii) culture-based laboratory surveillance. Positive samples were serotyped. The molecular serotyping assay included targets for 42 serotypes including all serotypes/serogroups included in the 7-valent (PCV-7) and 13-valent (PCV-13) PCV. The Quellung reaction was used for serotyping of culture-positive cases. We calculated the change in rates of IPD (lytA- or culture-positive) among HIV-uninfected children aged <2 years from the year of PCV-7 introduction (2009) to the post-vaccine years (2011 or 2012). RESULTS: During the study period there were 607 lytA-positive and 1,197 culture-positive cases that were serotyped. Samples with lytA cycle threshold (Ct)-values ≥35 (30.2 %; 123/407) were significantly less likely to have a serotype/serogroup detected for serotypes included in the molecular serotyping assay than those with Ct-values <35 (78.0 %; 156/200) (p < 0.001). From 2009 to 2012 rates of PCV-7 serotypes/serogroups decreased -63.8 % (95 % CI: -79.3 % to -39.1 %) among lytA-positive cases and -91.7 % (95 % CI: -98.8 % to -73.6 %) among culture-positive cases. Rates of lytA-positive non-vaccine serotypes/serogroups also significantly decreased (-71.7 %; 95 % CI: -81.1 % to -58.5 %) over the same period. Such decline was not observed among the culture-positive non-vaccine serotypes (1.2 %; 95 % CI: -96.7 % to 58.4 %). CONCLUSIONS: Significant downward trends in IPD PCV-7 serotype-associated rates were observed among patients tested by PCR or culture methods; however trends of non-vaccine serotypes/serogroups differed between the two groups. Misclassifications of serotypes/serogroups, affecting the use of non-vaccine serotypes as a control group, may have occurred due to the low performance of the serotyping assay among lytA-positive cases with high Ct-values. Until PCR methods improve further, culture methods should continue to be used to monitor the effects of PCV vaccination programs on IPD incidence. |
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