| [physiopathology of hepatitis b virus infection]. | hepatitis b associated antigen (hb-ag) may be observed in the serum in subjects either apparently healthy or exhibiting a number of disease symptoms. its incidence among the geneva voluntary blood donors is 0.48% with 54% exhibiting the surface antigen ad and 34% ay. while the hb-ag positive blood donors appeared clinically healthy, minor pathology was found in the majority of them (thrombocytopenia, histological evidence of inflammatory foci, of persistent hepatitis and of chronic aggressive he ... | 1975 | 240199 |