Acute type A hepatitis during chronic hepatitis B virus infection: Association of depressed hepatitis B virus replication with appearance of endogenous alpha interferon

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Abstract
Two patients with chronic type B hepatitis and intercurrent episodes of acute type A hepatitis are presented. Serological markers of hepatitis B virus replication decreased or became undetectable in both patients during the acute illness, while interferon activity was transiently detected in serum. The presence of serum leukocyte (alpha) interferon was confirmed by neutralization with specific antisera and tests of pH2 stability. These observations suggest a role for natural leukocyte (alpha) interferon in the modulation and control of hepatitis B virus infection and provide further evidence to support trials of exogenous leukocyte (alpha) interferon in the chronic infection.