More than two dozen Arizonans will participate in a medical trial for an AIDS vaccine. Twenty healthy residents between ages 18 and 65 will undergo the trial at research centers in Mesa and Peoria. The study is paid for by Merck, one of several drug makers that are testing vaccines designed to make the body resistant to HIV. An additional 10 people will participate in a similar study at a Phoenix HIV/AIDS research and resource center. The National Institutes of Health estimates that as many as 900,000 people in the United States are HIV-positive. As many as 5.6 million people worldwide become infected with the AIDS virus each year, according to the World Health Organization.

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