The epidemiology of viral hepatitis: an overview.

摘要: Type A hepatitis maintains itself in human populations without either an extrahuman or reservoir. Intestinal carriers do not appear to be epidemiologically important; viremic have been demonstrated. Person-to-person transmission by the fecal-oral route is usual mechanism. Epidemic and endemic occurrence usually recognizable well-defined characteristics; a "hyperendemic" patern has documented. In some countries, but all, long-term trend of type disease downward recent years. B worldwide distribution, capable maintaining carrier Transmission multiple mechanisms, with percutaneous still major importance when adequately defined terms subtle exposures. Contact-associated probably occurs both oral-oral venereal routes. The unknown, evidence suggests increase United States apart from epidemic associated drug abuse. existence additional viruses suggested data concerning transfusion-associated episodes same individual.