For over a decade, taking a pill like Truvada every day has been the standard of care for HIV prevention efforts.
In clinical trials, this type of preventive drug, called pre-exposure prophylaxis (PrEP), can be 99 percent effective in stopping new HIV infections from sex. In the real world, however, that is not always the case.
People don't always take their pills. In a study in South Africa, women said they felt there was a stigma to the pill —- a sexual partner might assume they’re taking it because they already have HIV or because they have other partners.
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