Abstract
10 healthy blood donors persistently seropositive for anti-HBs and without a history of clinically overt viral hepatitis were observed for periods of time ranging from 46 to 57 months. Physical examinations and biochemical liver function tests were normal in all cases. Immunologic studies of their immune response to hepatitis B virus antigens are suggestive for a late period of convalescence from clinically inapparent hepatitis B.
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