1 Introduction.- 2 Hepatitis A Virus: Biology, Pathogenesis, Epidemiology, Clinical Description, and Diagnosis.- 3 Hepatitis B Virus: Biology, Pathogenesis, Epidemiology, Clinical Description, and Diagnosis.- 4 Hepatitis C Virus: Biology, Pathogenesis, Epidemiology, Clinical Description, and Diagnosis.- 5 Hepatitis D Virus: Biology, Pathogenesis, Epidemiology, Clinical Description, and Therapy.- 6 Hepatitis E Virus: Biology, Pathogenesis, Epidemiology, Clinical Description, Diagnosis, and Prevention.- 7 The GB Viruses: Discovery, Molecular Biology, Diagnosis, and Epidemiology.- 8 Laboratory Diagnosis of Viral Hepatitis.- 9 Antiviral Chemotherapy for Viral Hepatitis.- 10 Hepatitis A Vaccines.- 11 Hepatitis B Vaccines.