Abstract from 2nd International Symposium on Viral Hepatitis and Hepatocellular Carcinoma, Unresolved Issues in non-A, non-B hepatitis by A. Zuckerman (London School of Hygiene and Tropical Medicine). Contains an overview of hepatitis and detail on the epidemiology, incubation period, particle structure of NANBH. Includes a section comparing ALT and Anti-HBc surrogate testing with reference to two studies.