The most frequent was HIV infection (15 patients, 38.5%); the median of CD4 counts of these patients was 50.5 cells/μL (IQR 209.5); only one patient was receiving highly active antiretroviral therapy (HAART) at the time of hospitalization; the remaining had either previously abandoned therapy (9 patients) or were diagnosed on admission (5 patients). This evidence concerns the gene CD4 and HIV infectious disease.