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Preliminary data from a study of 162 HIV-positive gay and bisexual men in Chicago show that crystal methamphetamine users were about twice as likely as nonusers to have been recently infected with HIV, the Windy City Times reports. About 32% of the meth users were infected with HIV within 170 days of the study, compared with about 17% of nonusers. The drug users also reported having engaged in unprotected anal sex with five times as many partners as nonusers, city health officials report. Full report data is expected to be released by the Chicago Department of Public Health's Office of HIV/AIDS Surveillance by the end of the year.