We studied viral
hepatitis, type A, type B, type D and type non A non B. Type A
hepatitis was diagnosed by the serological examination for
IgM type anti-HA and total anti-HA. Several cases were negative for
IgM type anti-HA within 2 weeks after the onset of type A
hepatitis. Type B
hepatitis was diagnosed by RIA for serum HBs
antigen. Several cases of type B
hepatitis were negative for serum HBs
antigen but positive for
IgM type anti-HBc, or hepatocytes were positive for HBs
antigen. These cases had high titer of total anti-HBc. Type D
hepatitis was diagnosed by RIA for anti-delta in serum and by PAP
stain for
delta antigen in hepatocytes. All cases of type D
hepatitis were positive for anti-delta in their serum and positive for
delta antigen in their hepatocytes, they were positive for HBs
antigen. Incidence of HDV
infection was 0.7% in HBV carrier. The incidence of non A non B
hepatitis was 27.6% in 105 recipients and the incidence of its progression to the chronicity was 20.0%.