Craun G F
Am J Public Health. 1979 Aug;69(8):817-9. doi: 10.2105/ajph.69.8.817.
Twenty-three waterborne outbreaks of giardiasis have been reported in the US, 1972-77. Data indicate that disinfection as the only treatment for surface water sources is ineffective in preventing waterborne transmission of this organism. To protect against transmission, all surface water should receive chemical pretreatment, preferably with sedimentation, and filtration in addition to disinfection. Outbreak data indicate that negative coliform tests do not provide assurance that water is free of Giardia cysts.
1972年至1977年期间,美国报告了23起水源性贾第鞭毛虫病疫情。数据表明,仅将消毒作为地表水水源的唯一处理方式,对于预防该病原体的水源性传播是无效的。为防止传播,所有地表水都应进行化学预处理,最好先进行沉淀,除消毒外还应进行过滤。疫情数据表明,大肠菌群检测呈阴性并不能保证水中没有贾第虫囊肿。