Our data suggest that, independent of other risk factors, black race is linked to the occurrence of BV/intermediate vaginal flora. Race is also independently associated with an absence of H₂0₂+ lactobacilli and the presence of G. vaginalis, M. hominis, Gram negative pigmented or non-pigmented anaerobic rods, and Mobiluncus morphotypes from the vagina, as well as N. gonorrhoeae or С trachomatis isolated from the cervix. The remarkable internal consistency in these microbiologic data reassures us as to the internal validity of our findings. Furthermore, our observations may be conservative because race was part of the selection criteria for this high risk sample, thus white-women needed to get more “points” towards enrollment than blacks, implying that whites needed a higher risk profile for study entry. If white women were of higher risk and therefore more likely to have BV, this fact would tend to make the racial differences in BV observed in this study an underestimate.

Previous estimates of the occurrence of BV have ranged from 19% to 57% among black women and from 9% to 38% among whites. Few other studies have systematically examined the risk factors for BV among race-specific groups of women. However, comparing studies conducted in Africa with those conducted in the US, there appears to be agreement that a group of factors common to both racial groups increases the probability of BV positivity. Risk factors for BV that we and others have consistently identified in both black and white women include low socioeconomic status, a history of having STD’s, and douching.
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A limited number of previous studies have examined the association between race and BV independent of other known BV risk factors. In the only prospective cohort study, Hawes et al. enrolled 182 women from STD clinics in Seattle, Washington, and found that, after adjustment for a variety of covariates including no/H₂0₂ – lactobacilli, prior BV, new sexual partner, douching, age >20, antibiotic use, and barrier contraception use, women of non-white race were not significantly more likely to acquire BV (OR 1.2, 95% CI 0.6-2.3). Similarly, in a cross-sectional study conducted among 100 women with and 100 without BV enrolled from an STD clinic in London, England, Rajamanoharan et al. found no significant relationship between race and BV after adjusting for use of vaginal antiseptics, history of BV, barrier contraception, and occupation.

On the other hand, a recent cross-sectional study by Holzman et al., enrolling a larger number of women from health department, family planning, and university health clinics (496 nonpregnant women) showed that blacks with lower (<13 years) education had a substantially elevated risk of BV as compared to white, higher educated women, after adjustment for douching, parity, and hormonal contraceptive use (OR 5.5, 95% CI 2.1-14.5). In that same study, white women with lower educational attainment were only 1.6 times (95% CI 0.8-3.4) more likely to have BV. Furthermore, Royce et al. found that in a cohort of 842 pregnant women, blacks were more likely to have В V independent of other risk factors. Finally, Goldenberg, enrolling over 13,000 pregnant women from urban US medical centers, found black race to be associated with BV (OR 2.9, 95% CI 2.5-3.4) as well as C. trachomatis, and N. gonorrhoeae, after adjustment for risk factors.
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Analysis of our GIFT study data suggests a potential explanation for the inconsistency in the previous literature. Reports that have failed to identify an independent link between black race and BV enrolled women from STD clinics wherein rates of gonococcal or chlamydial cervicitis tend to be high. Like these studies, we found no association between race and BV among women with cervicitis. In contrast, studies that reported an independent link between race and BV recruited larger numbers of women from a variety of sites including, but not confined to STD clinics, wherein a substantial number of women would be free of gonococcal or chlamydial cervicitis. Like them, we found an association between race and BV among women without cervicitis. Gonococcal or chlamydial cervicitis may alter the vaginal flora such that differences between racial groups are no longer evident. Alternatively, BV may predispose to cervicitis such that, for all groups of women, rates of BV among women with cervicitis are quite high.

As has been pointed-out, race distinctions are not evident within the structure of the genome. Yet, functionally, black adolescents may be predisposed to developing the microenvironment that defines BV. Black adolescents appear to have a more alkaline pH than white adolescents, making a greater susceptibility to BV. Culhane et al. have suggested that higher chronic stress levels may account for the excess of BV found in black pregnant women. Beyond that observation, the reason for an enhanced susceptibility to BV among black women is speculative. Although Royce et al. suggested that Mobiluncus morphotypes on Gram-stain might underlie a large proportion of the association between race and BV, we could not replicate this finding. We also point out that Mobiluncus morphotypes are found in a minority of women with BV.
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The public health importance of our findings is that the presence of BV implies risk for serious diseases including acquisition of HIV-1, preterm births, and PID. Understanding the susceptibility among black women to BV might result in modifiable strategies for prevention of BV and its serious consequences.

Particular strengths of our study include the large number of women studied, the use of consistent enrollment and data collection protocols, the use of an expert microbiology laboratory masked to each woman’s reported douching behavior, the internal consistency between the BV-related vaginal microflora and the assurance that race preceded the occurrence of BV.

Nonetheless, our study design could not completely exclude the possibility that unmeasured confounding might have influenced our result. It has been suggested that control for confounding is often inadequate when considering racial disparities because of an incomplete understanding of how to measure the social meaning of race. Thus, unmeasured social differences may yet explain racial differences in the occurrence of В V Overall, then, among 900 black women and 235 white women, race was independently associated with bacterial vaginosis, lack of H₂0₂+ lactobacilli, and presence of BV-associated anaerobes and facultative aerobes as well as gonococcal or chlamydial cervicitis. Because BV has been linked to acquisition of HIV, preterm birth, and PID, it is critical to understand what causes the susceptibility to BV among black women. suhagra