Human Hepatitis Viruses A and B as Etiological Agents of a Hemorrhagic State

A large variety of viruses may cause hepatitis in man. Most of these, however, cause syndromes of which hepatitis forms only a minor part or is an occasional complication. There is, on the other hand, a group of viruses which regularly cause hepatitis as their most prominent feature, and they are classified together, purely on clinical grounds, as the human hepatitis viruses.