Study visits: Enrolment + follow-up Data collection: For all HIV-1 positive patients enrolled and under follow up, laboratory, therapeutic and clinical data on HIV, viral hepatitis and serious non-AIDS clinical events are collected, as well as demographic data and possible data on pregnancy and the HIV status of the newborn baby. The patients are seen within their clinics as required and according to their local physician. EuroSIDA does not involve patient interviews or study visits, the information is collected from patient notes twice a year.