Thirty-eight papers on chronic active hepatitis, presented at the International Symposium on Problems of Chronic Hepatitis in April 1975 in Montecatini, Italy. Divided into sections on morphological, histochemical, histogenetic, functional, immunologic, clinical, nosologic, and therapeutic aspects. Differing opinions as to definition and pathogenesis of the disease are presented by international authorities. Sixty-eight figures; 58 tables.