Background The cervicovaginal microbiota, including sexually transmitted infections (STIs), have not been well described in female genital schistosomiasis (FGS). Methods Women (aged 18–31, sexually active, nonpregnant) were invited to participate at the final follow-up of the HPTN 071 (PopART) Population Cohort in January–August 2018. We measured key species of the cervicovaginal microbiota (Lactobacillus crispatus, L. iners, Gardnerella vaginalis, Atopobium vaginae, and Candida) and STIs (Chlamydia trachomatis, Neisseria gonorrhoeae, Trichomonas vaginalis, and Mycoplasma genitalium) using quantitative PCR (qPCR). We evaluated associations of the microbiota and STI presence and concentration with FGS (qPCR-detected Schistosoma DNA in any of 3 genital specimens). Results The presence and concentration of key cervicovaginal species did not differ between participants with (n = 30) or without FGS (n = 158). A higher proportion of participants with FGS had T. vaginalis compared with FGS-negative women (P = .08), with further analysis showing that T. vaginalis was more prevalent among women with ≥2 Schistosoma qPCR-positive genital specimens (50.0%, 8/16) than among FGS-negative women (21.5%, 34/158; P = .01). Conclusions We found weak evidence of an association between the presence of T. vaginalis and FGS, with a stronger association in women with a higher-burden FGS infection. Additional research is needed on potential between-parasite interactions, especially regarding HIV-1 vulnerability.
Background Female genital schistosomiasis (FGS) occurs when Schistosoma haematobium eggs are deposited in reproductive tissue. Female genital schistosomiasis in the cervical mucosa is associated with increased vascularity. If FGS is associated with the presence of hemoglobin in cervicovaginal lavage (CVL), the use of urinary reagent strips to detect hemoglobin in CVL could supplement FGS diagnosis. Methods Nonmenstruating, nonpregnant, sexually active women aged 18–31 participating in the HPTN 071 (PopART) Population-Cohort were invited in 2 Zambian communities. Genital self-swabs and a urine specimen were collected at a home visit, and CVL and hand-held colposcopy were performed at a midwife led clinic visit. Urinary reagent strips were used to identify hemoglobin in CVL. Eggs and circulating anodic antigen (CAA) were detected from urine. Visual-FGS was defined as the presence of sandy patches, rubbery papules, or abnormal blood vessels. Polymerase chain reaction (PCR)-FGS was defined as Schistosoma deoxyribonucleic acid detected by real-time PCR on CVL or cervical or vaginal swab. Results Of 209 women with home genital swabs and companion CVL specimens, 66% (138 of 209) had detectable CVL hemoglobin, 13.4% (28 of 209) had PCR-defined FGS, and 17.2% (36 of 209) had visual-FGS. Active Schistosoma infection, diagnosed by CAA or urine microscopy, was present in 21.0% (44 of 209) participants. Active Schistosoma infection (P = .4), PCR-FGS (P = 0.7), and visual-FGS (P = 0.3) were not associated with CVL hemoglobin presence. Results did not differ in subgroups with high infection burden (cycle threshold < 35 or 2–3 positive genital PCR). Conclusions Polymerase chain reaction-FGS, visual-FGS, and active Schistosoma infection were not associated with the presence of CVL hemoglobin. Further research is needed to establish accessible community-based FGS diagnostics.
Glycogen is the most abundant vaginal carbohydrate in reproductive aged women. Reduced vaginal glycogen is associated with lower levels of Lactobacillus crispatus, overgrowth of fastidious anaerobes such as Gardnerella vaginalis and increased risk of adverse reproductive and sexual health outcomes. Here we show that Gardnerella vaginalis, Lactobacillus iners and Lactobacillus crispatus can autonomously utilize glycogen as a source for growth. Using an ungelatinized and labeled form of raw amylose, a more degradation-resistant α-1,4-glucan, we were able to discriminate between the alpha-glucosidase activities of common vaginal bacterial species. The bacteria Lactobacillus crispatus, Lactobacillus iners, Gardnerella piotii as well as several other common vaginal species were not capable of raw amylose degradation, while Gardnerella vaginalis, Gardnerella swidsinskii and Gardnerella leopoldii were, with the latter two having the highest degradation rates. In contrast to the glycogen-degrading activity we previously identified in Lactobacillus crispatus, this Gardnerella alpha-glucosidase activity was not cell-bound and not repressed in the presence of glucose. Raw amylose degradation activity in vaginal swabs was strongly associated with bacterial vaginosis as assessed by Nugent scoring. Overall, our results show that the dysbiotic microbiota of bacterial vaginosis is associated with increased amylolytic activity, which is also found in pure cultures of Gardnerella species, but not in other common vaginal bacteria.
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