Hepatitis B virus infection in Cameroon: a seroepidemiological survey in city school children.

A pilot survey conducted in Cameroon comprising 702 children of primary school age revealed that 58.5% of the children were positive for at least one HBV marker. An overall HBsAg prevalence of 19.9% was observed. Both any HBV marker and HBsAg prevalences increased with age (P less than 0.01). Of the HBsAg-positive subjects, 28.4% were positive for HBV-DNA; none was positive for anti-HDV. There was no significant difference among sexes for either any HBV marker or for HBsAg prevalence. However, a significant difference by sex was found in the percentage ratio HBsAg+/and any marker + (41.0% in males against 28.2% in females; P less than 0.05). No significant difference with respect to the father's occupation and family size was observed. When the zone of location of school was taken into consideration it was observed that suburban school children had a higher prevalence of any HBV marker as compared to central town school children (73.9% vs. 56.6%; P less than 0.001). These results place Cameroon among countries of high endemicity for HBV. The results also indicate an early acquisition of infection, a high infectivity, and probably continuous infection even in the primary school ages.