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

Nancy F Crum-Cianflone, Xun Wang, Amy Weintrob, Tahaniyat Lalani, Mary Bavaro, Jason F Okulicz, Katrin Mende, Michael Ellis, Brian K Agan, Nancy F Crum-Cianflone, Xun Wang, Amy Weintrob, Tahaniyat Lalani, Mary Bavaro, Jason F Okulicz, Katrin Mende, Michael Ellis, Brian K Agan

Abstract

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.

Keywords: HIV; MRSA; Staphylococcus aureus; behaviors; colonization; human immunodeficiency virus; risk factors; skin and soft tissue infections.

Figures

Figure 1.
Figure 1.
Venn diagram of the overlap of incident Staphylococcus aureus colonization at various body sites. Each circle size is proportional to the number colonized at each anatomic site. Perigenital is groin and/or perirectal colonization. The axilla site was omitted for simplicity.

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Source: PubMed

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