RESUMEN
The prevalence of hepatitis B and A markers were studied among blood donors in Casablanca. 7.6% of the tested individuals have HBs Ag. Among them 57.1% are highly infectious because they have HBe Ag. 34.78% of sera contain HBs Ab and 16.85% contain HBc Ab alone, 59.24% of the blood donors have at least one marker associated to hepatitis B virus. This prove the high degree of infectiosity by hepatitis B virus in Marocco. 24.46% of blood donnors have HBc Ab associated or not with HBs Ag and so they are potentially infectious. This study explain the importance of obligatory systematic research of HBs Ag and/or HBc Ab in all blood products which will be transfused in Morocco. 93.80% of the sera contain HVA-Ab, this explain the high epidemiological character of this infection