WASHINGTON (Reuters) - Two large clinical trials in Africa are ramping up to test the effectiveness of a vaginal ring that releases an HIV-fighting drug for a month or more, offering women at high risk a discreet way to protect themselves from the virus that causes AIDS. The studies will test the effectiveness of a vaginal ring containing the antiretroviral drug dapivirine in thousands of women in several African countries to evaluate its ability to prevent new HIV infections and its long-term safety. If effective, the ring will add "a long-acting, female-initiated technology to the existing toolkit of HIV...
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