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Examination of Chlamydia trachomatis infection in environments mimicking normal and abnormal vaginal pH.

BACKGROUND: It has long been assumed that a healthy acidic vaginal environment inhibits infection by Chlamydia trachomatis. The research objectives were to evaluate the effect of pH on C trachomatis infection by two in vitro methods, to assess pH effect at different serial dilutions of C trachomatis elementary bodies (EBs), and to examine protection by an antibiotic peptide, protegrin (PG-1), over a pH range. GOALS: The goals of this study were to test the hypothesis that acidic pH inhibits C trachomatis infection and to determine the ability of PG-1 to provide protection at acidic and neutral pH. STUDY DESIGN: The effect of pH on C trachomatis was examined using two pH-adjusted preincubation shell vial assays. C trachomatis EBs (serovars L2, D, and E) were exposed to pH-adjusted media, with and without PG-1, and infection was assessed by inclusion forming unit (IFU) formation in McCoy cell monolayers. RESULTS: Acidic pH in preincubation media markedly decreased IFUs by both in vitro methods. Serial dilution experiments showed a 3- to 10-fold reduction in IFUs for C trachomatis (L2 and E) at pH 5.0, compared with those at pH 7.5. C trachomatis (D) showed a 17- to 23-fold reduction in IFUs (serial dilutions 1:1-1:4). PG-1 protected McCoy cell monolayers from infection by C trachomatis after exposure to varied pH environments. CONCLUSION: Acidic pH exposure significantly reduced C trachomatis infection in vitro. Our results support the hypothesis that a healthy acidic vaginal environment protects women from C trachomatis infection. In addition, antibiotic peptides may provide protection as topical microbicides, regardless of vaginal pH.

Anti-Bacterial Agents↗

Influence of HIV-1 coinfection on effective management of abnormal vaginal discharge.

BACKGROUND: Reports on microbiologic cure rates following syndromic management (SM) of women with nonulcerative sexually transmitted infections (STIs) are limited. GOAL: The goal of the study was to determine the effectiveness of the drugs used in SM of nonulcerative STIs and bacterial vaginosis in women and to compare the response among those with and without HIV-1 coinfection. STUDY DESIGN: This was a cohort study of women with nonulcerative STIs who were treated according to local SM protocols. RESULTS: Of 692 women recruited, 415 (80%) returned 8 to 10 days later, and 290 (70%) consented to a second examination, in which specimens were obtained. Clinical cure was reported by 67%, and microbiologic cure ranged from 80% to 89% for the three discharge-causing STIs and was independent of HIV-1 status. Only 38% of those with bacterial vaginosis were cured, and HIV-1-infected women were less likely to be cured (28% versus 52%; P < 0.001). CONCLUSIONS: Clinical and microbiologic response to SM of the nonulcerative STIs was not affected by HIV-1 coinfection, but cure rates for bacterial vaginosis were reduced.

Adolescent↗