Abstract
AVAILABLE evidence indicates that virus A, the etiologic agent of infectious hepatitis, has a world-wide distribution. The short duration since infectious hepatitis has been reportable is such that available information has resulted mainly from epidemics whose proportions were large enough to attract attention. Because of the lack of a suitable laboratory animal, full knowledge of the problems associated with the disease is lacking, and evidence so far indicates a fecal-oral route of transmission. Although epidemics of hepatitis due to virus A have resulted from fecal contamination of water,1 , 2 milk3 and food,4 it is considered that the usual mode of spread . . .

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