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It is very likely that sex changes the vaginal microbiome, says Janneke van de Wijgert at the University of Liverpool, UK — although she warns that studies like this can be unreliable, because people often lie about sex. This is probably a bad sign for vaginal health, as both species have been linked to bacterial vaginosis, a poorly understood condition that causes abnormal discharge and bad odour. The bacterial communities of healthy vaginas tend to be dominated by one type of bacteria. The women were all young students, and 19 had not yet experienced penetrative sex at the start of the study. Those that started having penile-vaginal sex for the first time during the study tended to go on to have a vaginal microbiome dominated by these two strains. Each time bacteria are added to the system, you might expect it to move away from its equilibrium point, he says. Researchers are trying to develop probiotics that can restore a healthy community of vaginal bacteria. Can an N95 face mask protect you from catching the new coronavirus?

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