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A study, published in The Lancet Infectious Diseases, said a high proportion of women who live in sub-Saharan Africa who used a hormonal injectable or oral contraceptive, were at greater risk for contracting HIV.

Pam Belluck wrote about the study for The New York Times. Her story focused on the hormone shot — most likely, Belluck says, a generic version of Depo-Provera.

"The hormone shots may have been causing some biological effect that is making it more likely for women who don’t have HIV to contract it from their partner," Belluck explained. "And, in another finding, when they had couples where the women did have HIV, but the men didn’t, the men were more likely to have it transmitted from the women if the women were using that hormone shot."

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