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在美国自鉴定出甲型肝炎病毒以来,对甲型肝炎的流行病学仍未完全了解。本病毒经粪-口传播机理虽已充分被阐明,但在美国社会中传播的基本形式尚不明。为了确定日托中心在广大社会中传播甲型肝炎的重要性
Since the hepatitis A virus was identified in the United States, the epidemiology of hepatitis A has not been fully understood. Although the virus has been fully explained by the fecal-oral transmission mechanism, the basic form of transmission in American society is not yet known. In order to determine the importance of day care centers transmitting hepatitis A in the wider community