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Progesterone-HIV link questioned by new studies.


 Several small studies conducted by the Centers for Disease Control and Prevention (CDC) have shown that although progesterone appears to increase the likelihood of simian immunodeficiency virus (SIV) transmission in exposed monkeys, women using hormone contraceptives do not appear to have the same increased risk for HIV. The results, published in the May issue of Science, show little, if any, increase in the rate of HIV infection in women on Depo-Provera, an injectable contraception containing progestin, compared to those who were not taking it. Another study, conducted in Thailand, found similar results. However, this contrasts sharply with the results of a monkey study that found that rhesus monkeys given progesterone experienced significant thinning of the vaginal wall. Researchers are examining the effects of progesterone on the lining of the vagina. Researchers are finding some thinning, but not to a significant degree. The CDC continues to stress that only abstinence or the use of latex condoms can prevent the spread of AIDS.
