某些肠道菌在水中存活期限的实验室观察

<正> 水源污染是肠道致病菌重要的传播途径之一。为消毒措施和流行病学防治提供依据,我们从不同水源采集水样,在实验室观察了多种肠道致病菌在其中的存活情况。

LABORATORY OBSERVATION ON SURVIVAL TIMES OF SOME ENTEROBACTERIA IN WATER

The survival times of Vibrio cholerae biotype eltor, V.cholerae 569B, nonagglutinable vibrio (NAV), Escherichia coli and Salmonella typhi in different water semples were observed in laboratory. In the experiment (9～19℃) , V.cholerae (eltor) could keep alive for 13 days in pond water, 14 days in river water, 18 days in well water and 19 days in the water of junction part of sea and river (water of JSR). In the water of JSR, E.coli, S.typhi and V.cholerae 569B were able to exsist for longer than 35 days, 29 days and 18 days respectively. In the supernatant of the water of JSR after sedimentation, V.cholerae (eltor) could only live for 4～10 days, while NAV could keep alive for longer than 55 days. The survival time of V.cholerae (eltor) in boiled sediment could be prolonged to 25 days.The higher the temperature, the shorter the survival time of V.cholerae (eltor) in water. It could remain alive for 9～13 days at 16～21℃, 4～7 days at 25～28℃ and only 1～5 days at 26～32℃. V.cholerae (eltor) could live longer in water breeding fishes than the water without fish,