The makeup of bacteria that colonize a man's penis can help predict the risk of a serious and hard-to-treat vaginal infection in his female partner, new research suggests. Bacterial vaginosis, also known as BV, can lead to problems in pregnancy and make a woman more vulnerable to several sexually transmitted diseases. More than 20% of women worldwide get BV. For this study, researchers tracked 168 couples and found that women whose partner had BV-related bacteria on their penis were more likely to develop BV within a year.
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