Figure. Annual incidence of multidrug-resistant USA300 infection and percentage of male same-sex couples, by San Francisco ZIP code.

The key indicates the annual incidence of multidrug-resistant USA300 infection per 100 000 persons. The number within each ZIP code is the percentage of male same-sex couples, calculated by dividing the number of male same-sex, unmarried-partner households by the number of coupled (married and unmarried) households for each ZIP code, based on 2000 U.S. Census (Summary File 3) data (33). *Location of the San Francisco General Hospital HIV clinic.

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