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The annual rate of new HIV infections in men who have sex with men in San Francisco has doubled over the past four years, from 1.04% in 1997 to 2.2% in 2001. This rise has alarmed epidemiologists because the incidence of HIV infection in the city's gay community had been stable from 1992 to 1996. Willi McFarland, chief of the San Francisco seroepidemiology unit, told the BMJ : “The weight of evidence now …
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Gavin Yamey (2001) studied this question.
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