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Background. Few data exist on the incidence and risk factors of Staphylococcus aureus colonization and skin and soft tissue infections (SSTIs) among patients infected with human immunodeficiency virus (HIV). Methods. Over a 2-year period, we prospectively evaluated adults infected with HIV for incident S aureus colonization at 5 body sites and SSTIs. Cox proportional hazard models using time-updated covariates were performed. Results. Three hundred twenty-two participants had a median age of 42 years (interquartile range, 32–49), an HIV duration of 9.4 years (2.7–17.4), and 58% were on highly active antiretroviral therapy (HAART). Overall, 102 patients (32%) became colonized with S aureus with an incidence rate of 20.6 (95% confidence interval [CI], 16.8–25.0) per 100 person-years [PYs]. Predictors of colonization in the final multivariable model included illicit drug use (hazard ratios [HR], 4.26; 95% CI, 1.33–13.69) and public gym use (HR 1.66, 95% CI, 1.04–2.66), whereas antibacterial soap use was protective (HR, 0.50; 95% CI, 0.32–0.78). In a separate model, perigenital colonization was associated with recent syphilis infection (HR, 4.63; 95% CI, 1.01–21.42). Fifteen percent of participants developed an SSTI (incidence rate of 9.4 cases [95% CI, 6.8–12.7] per 100 PYs). Risk factors for an SSTI included incident S aureus colonization (HR 2.52; 95% CI, 1.35–4.69), public shower use (HR, 2.59; 95% CI, 1.48–4.56), and hospitalization (HR 3.54; 95% CI, 1.67–7.53). The perigenital location for S aureus colonization was predictive of SSTIs. Human immunodeficiency virus-related factors (CD4 count, HIV RNA level, and HAART) were not associated with colonization or SSTIs. Conclusions. Specific behaviors, but not HIV-related factors, are predictors of colonization and SSTIs. Behavioral modifications may be the most important strategies in preventing S aureus colonization and SSTIs among persons infected with HIV.

Specific Behaviors Predict Staphylococcus aureus Colonization and Skin and Soft Tissue Infections Among Human Immunodeficiency Virus-Infected Persons