The best immunosuppressive regimen in HIV-infected renal transplant recipients has not been established. Thymoglobulin has been associated with an increased risk of serious bacterial infections in HIV-negative patients and, for this reason, there is some concern over its use in the HIV-infected population. We describe three consecutive HIV-infected renal transplant recipients who received thymoglobulin as induction therapy, and we compared their progress with a cohort of 23 HIV-negative recipients. Median follow-up was 24 and 11 months, respectively. Nadir lymphocytopenia was observed at 1 week in both groups, and their absolute lymphocyte count recovery was similar. An early and deep (<30 cells/mm(3)) CD4(+) T cell lymphocytopenia was seen in two of the three HIV-infected patients. No opportunistic infections were diagnosed in HIV-positive patients. One HIV-positive patient had a bacterial infection and five HIV-negative patients had one or more bacterial infections. Thymoglobulin was safe in our three HIV-infected renal transplant recipients. Until those data are confirmed in larger studies, close monitoring is recommended during the thymoglobulin-induced CD4(+) T cell lymphocytopenia period.