Researchers who were testing a daily AIDS prevention pill have made the decision to stop the study because of a lack of positive results from the pill.
So far, test results of women taking the Gilead Sciences Inc. pill Truvada show that they are just as likely to get HIV as women taking placebos.
Even if the study continues, it will not be able to determine whether the pills do any good. The results are a disappointment because a study last fall found that Truvada did help prevent infections in gay and bisexual men, and many AIDS experts view it as a breakthrough.
The results of the pill were announced Monday.
The Associated Press contributed to this report.