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Incidence of hepatitis B surface antigen (HBsAg) and human immunodeficiency virus (HIV) seroconversion among regular blood donors, National Blood Transfusion Center, Abidjan, Côte d’Ivoire, 1992 – 2012. Incidence rates of becoming HBsAg positive or seroconverting anti-HIV antibody positive in regular blood donors for each 3-year period. Incidence rates are stratified according to sex (A) and age groups (B). Vertical bars represent 95% confidence intervals. P-Y, person-years.
