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[Virus-induced liver diseases in humans. I. Viral hepatitis].

Although many viral agents may be associated with inflammatory hepatic changes, the vast majority of clinically important viral hepatitis is caused by hepatitis A, hepatitis B and the non A, non B agents. Infection of the liver of man by these hepatotropic agents is still a major public health problem in all parts of the world and constitutes a major hazard of the transfusion of blood and plasma derivatives. The magnitude of this hepatitis problem is not only documented by the about 200 million carriers of the hepatitis-B virus throughout the world, many of them asymptomatic, but also by the fact, that hepatitis B and non A, non B may progress to chronic liver disease, including cirrhosis and probably primary liver cancer. Potentially important pathogenetic determinants include viral factors such as subtype, dosage and mode of transmission and host factors such as age, sex, preexisting liver disease, coexisting non-liver disease (diabetes etc.), genetics and immune response to viral or autoantigens. As the virus itself seems not directly cytopathic, the diversity of lesions has been attributed to variation in the capacity of the host's response.