the low frequency of hbsag in mogadishu children may have one of the following explanations : ( i ) the infection occurs during adolescence , ( ii ) mogadishu is a low-prevalence area and the examined adults were not born in mogadishu , or ( iii ) a change in hepatitis b epidemiology has taken place in the area during the last 2 decades and the relatively higher prevalence of hbsag in adults might reflect higher rates of infection in their childhood .
C0001578
adolescence
C0231335
childhood