After eligibility screening and written informed consent, sociodemographic characteristics and HIV epidemiological data were collected using a standardized questionnaire. The questionnaire was administered by a trained study team during a face-to-face interview. After the interview, information on biological variables and ART treatment was obtained from another data source (biological database and pharmacy). Sociodemographic and clinical characteristics (age, sex, nationality, ethnic group, WHO clinical stage, history of antiretroviral therapy) were collected. Biological variables collected were absolute CD4 count, HIV type, HLA type and presence of HLA-B*57:01. From each patient, whole blood samples were collected at the elbow fold in two EDTA tubes and were used for the detection of the HLA-B*57:01 allele.

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