A．D/P at xx days after sight
B．D/P at xx days after presentation
C．D/P at xx days after bill of lading date
D．D/P at xx days after date of goods arrival

A．患者是唯一的传染源
B．以消化道传播为主
C．病后可获暂时性免疫力
D．发病以夏季为主
E．恢复期患者存在携带病毒现象