When preventing HIV, bacteria in the vagina matter
Some microbes appear to break down drug in prophylactic gel, making it less effective
![applicator](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/06/060117_ac_microbiome_free.jpg?fit=860%2C460&ssl=1)
DOSE OF GEL Women use an applicator (shown) to self-administer a vaginal gel containing the HIV-prevention drug tenofovir. Vaginal bacteria affect how well the drug works, a new study suggests.
CAPRISA