RATIONALE-With the advent of Highly Active Antiretroviral Therapy (HAART), sepsis has become a more frequent ICU diagnosis for patients with HIV infections. Yet, little is known about the etiologies of acute infections in critically ill patients with HIV and the factors that affect inhospital mortality.METHODS-Cases of patients with HIV requiring intensive care specifically for severe sepsis were identified over 27 months. Demographic information, variables related to acute illness severity, variables related to HIV infection, and all acute infections contributing to ICU stay were recorded.RESULTS-Of 990 patients admitted to the ICU with severe sepsis, 136 (13.7%) were HIVinfected. There were 194 acute infections among the 125 patients with full data available; 112 of the infections were nosocomial/healthcare-associated, 55 were AIDS-related, and 27 were community-acquired. Patients with nosocomial/healthcare-associated and AIDS-related infections had lower CD4 counts and were less likely to be on HAART (p<0.05). The inpatient mortality was 42%. In a multivariable logistic regression model, only the APACHE II score (odds ratio, OR 1.12, 95% CI 1.02-1.23) was significantly associated with hospital mortality, although any HAART use (OR 0.53, 95% CI 0.22-1.33, p=0.18) approached statistical significance.