大约每例霍乱病例住院后10天内尚有20～30％的家庭成员及某些邻居可受感染。由于在印度次大陆霍乱总是最先经水传播的,因此,对当地传统的净水法(在贮水罐中加入钾矾)的效果进行检验。霍乱病例在住院后对病家观察访视10天,每天都了解病情及采集家属肛拭标本分离霍乱 About 20-30% of family members and some neighbors are infected within about 10 days after each case of cholera. As cholera is always the first waterborne in the subcontinent of India, the effect of the traditional local water purification method (adding potash in a water storage tank) was tested. Cases of cholera were observed for 10 days after hospitalization, and the patients were acquainted with the disease and the cholera