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This Article Full Text Full Text (PDF) All Versions of this Article: AJPH.2005.072249v1 97/6/1067    most recent Submit a response View Shopping Cart Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (3) Citing Articles via Google Scholar Google Scholar Articles by Schwarcz, S. Articles by Catania, J. Search for Related Content PubMed PubMed Citation Articles by Schwarcz, S. Articles by Catania, J. Related Collections HIV/AIDS Lesbian/Gay/Bisexual/Transgender Persons Surveillance Surveys

Sandra Schwarcz, MD, MPH, Susan Scheer, PhD, MPH, Willi McFarland, MD, PhD, Mitchell Katz, MD, Linda Valleroy, PhD, Sanny Chen, MPH and Joseph Catania, PhD

Sandra Schwarcz, Susan Scheer, Willi McFarland, Mitchell Katz, and Sanny Chen are with the San Francisco Department of Public Health, Calif. Linda Valleroy is with the Centers for Disease Control and Prevention, Atlanta, Ga. At the time of the study, Joseph Catania was with the University of California, San Francisco.

Correspondence: Requests for reprints should be sent to Sandra Schwarcz, San Francisco Department of Public Health, 25 Van Ness Ave, Suite 500, San Francisco, CA 94102 (e-mail: sandy.schwarcz{at}sfdph.org).

Objectives. We sought to determine the prevalence of HIV and novel cofactors of high-transmission-risk behavior in a probability sample of men who have sex with men (MSM).

Methods. We performed a cross-sectional telephone survey of 1976 adult MSM in San Francisco.

Results. We found an HIV prevalence of 25.2%. Predictors of unprotected insertive anal intercourse with a serodiscordant (not having the same HIV/AIDS serostatus) partner among HIV-infected men included use of Viagra and a greater number of partners in the past 12 months. Unprotected receptive anal intercourse with a serodiscordant partner among men not known to be HIV infected was independently associated with having lived in San Francisco for less than 1 year, use of crystal methamphetamine and amyl nitrites, a greater number of partners, and agreement with the statement, "You are less careful about being safe with sex or drugs than you were several years ago because there are better treatments for HIV now."

Conclusions. Strategies to prevent HIV for urban MSM should focus on new predictors of HIV transmission.

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