Extensive epidemiologic observations and experimental studies have closely defined the epidemiological characteristics of viral hepatitis A (MacCallum, 1972). Judicious use of specific diagnostic laboratory tests have helped differentiate the various forms of human viral hepatitis and provided conclusive answers to questions confronting the epidemiology of hepatitis A virus infection. Despite identification of subtile differences in incubation period, site of replication, route and duration of excretion, a close analogy exists between the epidemilogy of hepatitis A virus and that of poliovirus.
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