Résumé
The results obtained from epidemiological studies of hepatitis B antigen-antibody system in a rural village were reported. The studies were carried for 5 years on 2719 persons. Among them 1.1% were chronic surface antigen carriers, 0.2% were transiently antigen-positive in turn and 20.0% were antibody-positive.<BR>Some of the antigen carriers showed familial clustering. All surface antigen carriers with e-antibody, however, did not show familial clustering except one case. Subtype of <I>adr</I> is prevalent in this area. 13of15persons whose subtypes were identified, showed <I>adr</I> subtype. The remaining2were <I>adw</I>, and they were sporadic cases with no familial clustering. In a community a large family pedigree of carriers was discovered. Both antigen and antibody were prevalent among persons living in the community.<BR>Among pick-upped 144 persons who showed abnormal liver functions, 12 (8.3%) were found to be surface antigenpositive