INFECTIVE hepatitis has been known chiefly as a disease of war, but it has been described frequently during the past three decades as a sporadic, endemic and epidemic disease occurring in civilian populations all over the world.1234 During World War II an unprecedented pandemic of infective hepatitis occurred, and the increasing prevalence of this serious disorder in civilian practice makes it imperative to utilize the newer concepts of the disease and to apply the knowledge and experience gained during the recent conflict to the best diagnostic and therapeutic advantage.It is impossible, in the present state of knowledge, to designate . . .