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Viral hepatitis: current concepts.

As Australia antigen is related to the hepatitis virus that causes type B hepatitis, it is currently proposed that the antigen be called hepatitis B antigen (HBAg). About 5 percent of patients with acute HBAg-positive hepatitis become carriers of HBAg. When cirrhosis develops following acute viral hepatitis, in most instances it appears to evolve from type B hepatitis. There are numerous reports of frequent HBAg positivity among patients with hepatic carcinoma, raising the possibility that the hepatitis B virus itself may be oncogenic.