Last data update: Jun 11, 2024. (Total: 46992 publications since 2009)
Records 1-3 (of 3 Records) |
Query Trace: Adamson PC [original query] |
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Prevalence, anatomic distribution, and correlates of Chlamydia trachomatis and Neisseria gonorrhoeae infections among a cohort of men who have sex with men in Hanoi, Vietnam
Adamson PC , Bhatia R , Tran KDC , Bui HTM , Vu D , Shiraishi RW , Giang LM . Sex Transm Dis 2022 49 (7) 504-510 BACKGROUND: Neisseria gonorrhoeae (NG) and Chlamydia trachomatis (CT) disproportionately affect men who have sex with men (MSM). Data on the prevalence, anatomical distribution, and correlates of NG and CT infections among MSM in Vietnam are limited. METHODS: Between July 2017 and April 2019, MSM 16 years or older, without HIV were enrolled into an observational cohort study. Baseline data, including sociodemographics, sexual behavior, and HIV status were collected. NG and CT testing were performed on urine, rectal, and pharyngeal specimens. Multivariate logistic regression models identified factors associated with NG and CT infections at baseline. RESULTS: In total, 1489 participants underwent NG/CT testing. The median age was 22 years (IQR: 20 - 26). There were 424 (28.5%) NG or CT infections; 322 (21.6%) with CT and 173 (11.6%) with NG. Rectal infections were most common for CT (73.9%), while pharyngeal infections were most common for NG (70.5%). Independent risk factors for CT or NG infection included: ≥2 sex partners in the prior month (adjusted odds ratio [aOR] = 2.04; 95% CI: 1.44, 2.91), condomless anal sex (aOR = 1.44, 95% CI: 1.12, 1.86), and meeting sex partners online (aOR = 1.35; 95% CI: 1.03, 1.76). Recent genitourinary or rectal symptoms were not associated with infections. CONCLUSIONS: The overall and extragenital prevalence of NG and CT infections were high within this sample of young MSM without HIV in Hanoi. Testing limited to urethral specimens would have missed nearly three-quarters of CT and NG infections, supporting the need for routine testing at multiple anatomic sites. |
A systems-based assessment of the PrePex device adverse events active surveillance system in Zimbabwe
Adamson PC , Tafuma TA , Davis SM , Xaba S , Herman-Roloff A . PLoS One 2017 12 (12) e0190055 BACKGROUND: Voluntary Medical Male Circumcision (VMMC) is an effective method for HIV prevention and the World Health Organization (WHO) has recommended its expansion in 14 African countries with a high prevalence of HIV and low prevalence of male circumcision. The WHO has recently pre-qualified the PrePex device, a non-surgical male circumcision device, which reduces procedure time, can increase acceptability of VMMC, and can expand the set of potential provider cadres. The PrePex device was introduced in Zimbabwe as a way to scale-up VMMC services in the country. With the rapid scale-up of the PrePex device, as well as other similar devices, a strong surveillance system to detect adverse events (AE) is needed to monitor the safety profile of these devices. We performed a systems-based evaluation of the PrePex device AE active surveillance system in Zimbabwe. METHODS: The evaluation was based on the Centers for Disease Control and Prevention's Updated Guidelines for Evaluating Public Health Surveillance Systems. We adapted these guidelines to fit our local context. The evaluation incorporated the review of the standard operating procedures and surveillance system documents. Additionally, structured, in-person interviews were performed with key stakeholders who were users of the surveillance system at various levels. These key stakeholders were from the Ministry of Health, implementing partners, and health facilities in Harare. RESULTS: Clients were requested to return to the facility for follow-up on days 7, 14 and 49 after placement of the device. In the event of a severe AE, a standard report was generated by the health facility and relayed to the Ministry of Health Child and Care and donor agencies through predefined channels within 24 hours of diagnosis. Clinic staff reported difficulties with the amount of documentation required to follow up with clients and to report AEs. The surveillance system's acceptability among users interviewed was high, and users were motivated to identify all possible AEs related to this device. The surveillance system was purely paper-based and both duplicate and discrepant reporting forms between sites were identified. CONCLUSION: The PrePex AE active surveillance system was well accepted among participants in the health system. However, the amount of documentation which was required to follow-up with patients was a major barrier within the system, and might lead to decreased timeliness and quality of reporting. A passive surveillance system supported by electronic reporting would improve acceptance of the program. |
Mutations of the Listeria monocytogenes peptidoglycan N-deacetylase and O-acetylase result in enhanced lysozyme sensitivity, bacteriolysis, and hyperinduction of innate immune pathways
Rae CS , Geissler A , Adamson PC , Portnoy DA . Infect Immun 2011 79 (9) 3596-606 Listeria monocytogenes is a Gram-positive intracellular pathogen that is naturally resistant to lysozyme. Recently, it was shown that peptidoglycan modification by N-deacetylation or O-acetylation confers resistance to lysozyme in various Gram-positive bacteria, including L. monocytogenes. L. monocytogenes peptidoglycan is deacetylated by the action of N-acetylglucosamine deacetylase (Pgd) and acetylated by O-acetylmuramic acid transferase (Oat). We characterized Pgd(-), Oat(-), and double mutants to determine the specific role of L. monocytogenes peptidoglycan acetylation in conferring lysozyme sensitivity during infection of macrophages and mice. Pgd(-) and Pgd(-) Oat(-) double mutants were attenuated approximately 2 and 3.5 logs, respectively, in vivo. In bone-marrow derived macrophages, the mutants demonstrated intracellular growth defects and increased induction of cytokine transcriptional responses that emanated from a phagosome and the cytosol. Lysozyme-sensitive mutants underwent bacteriolysis in the macrophage cytosol, resulting in AIM2-dependent pyroptosis. Each of the in vitro phenotypes was rescued upon infection of LysM(-) macrophages. The addition of extracellular lysozyme to LysM(-) macrophages restored cytokine induction, host cell death, and L. monocytogenes growth inhibition. This surprising observation suggests that extracellular lysozyme can access the macrophage cytosol and act on intracellular lysozyme-sensitive bacteria. |
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