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Seroprevalence of Chlamydia trachomatis in Inner-City Children and Adolescents—Implications for Vaccine Development

imageBackground: Prevention of Chlamydia trachomatis infection is an ideal application for a vaccine program, which should optimally be administered before sexual debut. However, there are limited epidemiologic studies of C. trachomatis infection in an unselected pediatric population since routine screening and treatment of pregnant women was implemented in the United States in 1993. Methods: Anonymized serum samples were obtained from children younger than 21 years in 2 medical centers in Brooklyn, New York, from 2013 to 2015. Anti–C. trachomatis IgG antibody was determined by a validated enzyme immunoassay. Infants younger than 1 year were excluded from the final analysis due to interference of maternal antibody. Results: One thousand two sera were included in the final analysis. Fifty-seven percent were females. No antibody was detected at younger than 11 years. Anti–C. trachomatis IgG antibody was detected in 11.4% and 5.6% of female and male subjects, respectively, older than 11 years (P = 0.0027), and seropositivity increased with age. There was no significant difference in the distribution of age at infection between the centers (P = 0.432), but a difference was detected between genders (P = 0.012) with a higher percentage of female subjects testing positive. Conclusions: Antibody was first detected at 11 years of age, likely coinciding with sexual debut. The prevalence of antibody was higher and appeared earlier in females, mirroring national surveillance trends based on nucleic acid amplification testing. The delay in male antibody detection may be due to biological or behavioral differences between genders. These data are critical in informing potential C. trachomatis vaccine strategies. 12/01/2017 01:00 AM
 

Can Chlamydia Serology Be Used to Help Inform a Potential Future Chlamydia Vaccination Strategy?

No abstract available 12/01/2017 01:00 AM
 

Screening for Sexually Transmitted Infections in Adolescent Girls and Young Women in Mombasa, Kenya: Feasibility, Prevalence, and Correlates

imageIntroduction: As adolescents and young women become sexually active, they are at risk of adverse reproductive health outcomes including sexually transmitted infections (STIs). We assessed feasibility and acceptability of STI screening among 15- to 24-year-old women in Mombasa, Kenya. Methods: After sensitization activities, participants were recruited from 3 high schools and 1 university. Study staff conducted informational sessions. Students interested in participating were given consent forms to take home, and invited to visit our clinic for STI screening. During clinic visits, participants completed a self-administered questionnaire and provided a urine specimen for STI testing using a nucleic acid amplification test. Results: Between August 2014 and March 2015, 463 high school and 165 university students collected consent forms. Of these, 293 (63%) from high schools versus 158 (95%) from university attended clinic for STI screening (P < 0.001). Of the 150 (33%) who reported any history of insertive vaginal sex, 78 (52.0%) reported condom use at the last sex act, 31 (20.7%) reported using modern nonbarrier contraceptive methods, and 37 (24.7%) reported not using any contraception at the last sex act. Twenty-six (5.8%) participants were diagnosed with STIs (7 [1.6%] Neisseria gonorrhoeae, 16 [3.6%] Chlamydia trachomatis, 3 [0.7%] Trichomonas vaginalis). In multivariable analyses, reporting receptive vaginal sex without a condom was associated with having a laboratory confirmed STI (odds ratio, 6.21; 95% confidence interval, 1.72–22.28). Conclusions: These findings support the need for reproductive health interventions to reduce the risk of STIs in a population of adolescent girls and young women in East Africa. 12/01/2017 01:00 AM
 

Longitudinal Findings on Changes in and the Link Between HIV-Related Communication, Risky Sexual Behavior, and Relationship Status in Men Who Have Sex With Men Living With HIV

imageBackground: Reducing the risk of HIV transmission among men who have sex with men (MSM) is a national health priority. This study longitudinally examined changes in and the link between HIV-related communication, unprotected anal intercourse (UAI), and relationship status among MSM. Methods: Data were obtained from 337 MSM living with HIV who participated in a randomized controlled study. Approximately equal percentages of men were randomized to either the disclosure intervention group or the attention control case management group. Repeated measures were collected at 5 time points for 12 months and included health-protective sexual communication (HPSC), HIV disclosure, insertive and receptive UAI, and relationship status. Data were analyzed using mixed-effects models. Results: Independent of the treatment condition, HPSC and HIV disclosure increased over time; insertive UAI showed a curvilinear pattern but no significant decrease over time. Relationship status was related to HIV-related communication and UAI. Greater HPSC was related to less insertive and receptive UAI; disclosure was positively related to insertive UAI. Conclusions: Based on the findings, prevention programs should continue to focus on improving HIV-related communication among MSM and consider relationship status in prevention messages. Intervention studies are needed to continue to identify and test factors that help reduce risky sexual behaviors. 12/01/2017 01:00 AM
 

Selecting an HIV Test: A Narrative Review for Clinicians and Researchers

imageAbstract: Given the many options available, selecting an HIV test for a particular clinical or research setting can be daunting. Making an informed decision requires an assessment of the likelihood of acute infection in the test population and an understanding of key aspects of the tests themselves. The ability of individual tests to reliably detect HIV infection depends on the target(s) being detected, when they can be expected to be present after infection, and the concentration of stable target in test specimens, all of which are explained by the virologic and serologic events after infection. The purpose of this article is to review the timeline of HIV infection, nomenclature, and characteristics of different tests; compare point-of-care and laboratory-based tests; discuss the impact of different specimens on test performance; and provide practical advice to help clinicians and researchers new to the field select a test that best suits their needs. 12/01/2017 01:00 AM
 

The Evolution of HIV Testing Continues

No abstract available 12/01/2017 01:00 AM
 

Human Papillomavirus Prevalence Is Associated With Socioeconomic Gradients Within a Medically Underserved Appalachian Region

imageObjectives: To assess type-specific prevalence of human papillomavirus (HPV) infection in a medically underserved Appalachian area and to determine whether gradients in poverty are associated with prevalence. Methods: Among 398 women, a validated assay tested self-collected cervicovaginal samples for 37 HPV types. Three economic strata were created based on household income: below the federal poverty level for 1 person, between the FPLs for families of 1 to 4 persons, and above the FPL for a family of 4. Results: Prevalence was 55.6%, with 33% having at least 1 high-risk infection. Prevalence was 27.8% for 9-valent HPV vaccine–preventable types and 39.2% for multiple types. Compared with FPL for a family of 4, women with federal poverty level for 1 person had 3 times greater prevalence, 2.3 times greater prevalence of high-risk types, and 2.5 times greater prevalence of multiple types. Conclusion: Human papillomavirus prevalence was high, with one-third of the sample having at least 1 high-risk type and those in the lowest-income category being disproportionately infected. 12/01/2017 01:00 AM
 

Determinants of Human Papillomavirus Vaccination Intention Among Female Sex Workers in Amsterdam, the Netherlands

imageIntroduction: Female sex workers (FSWs) are at risk for human papillomavirus (HPV)–induced diseases but are currently not targeted by the HPV vaccination program in the Netherlands. We explored determinants of their intention to get vaccinated against HPV in case vaccination would be offered to them. Methods: In 2016, FSWs 18 years and older having a sexually transmitted infection consultation with the Prostitution & Health Center (P&G292) in Amsterdam, either at the clinic or at their working location, were invited to complete a questionnaire assessing sociopsychological determinants of HPV vaccination intention (scale ranging from −3 to +3). Determinants of HPV vaccination intention were assessed with univariable and multivariable linear regression. In addition, we explored the effect of out-of-pocket payment on intention. Results: Between May and September 2016, 294 FSWs participated. The median age was 29 years (interquartile range, 25–37 years). Human papillomavirus vaccination intention was high (mean, 2.0; 95% confidence interval [CI], 1.8–2.2). In multivariable analysis, attitude (β = 0.6; 95% CI, 0.5–0.7), descriptive norm (β = 0.2; 95% CI, 0.1–0.3), self-efficacy (β = 0.2; 95% CI, 0.1–0.3), beliefs (β = 0.1; 95% CI, 0.0–0.2), and subjective norm (β = 0.1; 95% CI, 0.0–0.2) seemed to be the strongest predictors of HPV vaccination intention (R2 = 0.54). Human papillomavirus vaccination intention decreased significantly to a mean of 0.2 when vaccination would require out-of-pocket payment of €350. Conclusions: The HPV vaccination intention among FSWs seems relatively high and is most strongly constituted in attitudinal, normative, and self-efficacy beliefs. Out-of-pocket payment will probably have a negative impact on their HPV vaccination acceptability. 12/01/2017 01:00 AM