Hsu B M, Huang C, Hsu C L
Department of Environmental Engineering and Health, Yuanpei Technical College, Hsinchu City, Taiwan, ROC.
Parasitol Res. 2001 Feb;87(2):163-8. doi: 10.1007/pl00008570.
Giardia and Cryptosporidium have emerged as waterborne pathogens of concern. Twenty-six water samples were collected from small water systems in Taiwan and checked for the occurrence of both parasites. Water quality parameters and characteristics of the sampling sites were also recorded. The frequencies of occurrence for Giardia and Cryptosporidium were 46.2% for each; and their mean concentrations were 79.5 cysts/100 l and 22.1 oocysts/100 l, respectively. The concentrations of oocysts and heterotrophic bacteria exhibited the highest correlation and followed the concentrations of the two protozoa. The water samples from sites with filtration devices had a lower oocyst concentration than those from sites without filtration devices, while no significant difference was found for cysts. The level of each parasite had no direct relationship with altitude. The cyst concentrations increased proportionally with the consumer population using the water systems. Risk assessment of the parasitic infections suggests that setting up disinfection devices in the small water systems would be needed.
贾第虫和隐孢子虫已成为备受关注的水源性致病原。从台湾的小型供水系统采集了26份水样，检测这两种寄生虫的存在情况。还记录了采样点的水质参数和特征。贾第虫和隐孢子虫的检出频率均为46.2%；它们的平均浓度分别为79.5个包囊/100升和22.1个卵囊/100升。卵囊和异养细菌的浓度呈现出最高的相关性，且与这两种原生动物的浓度相关。有过滤装置的采样点的水样中卵囊浓度低于没有过滤装置的采样点，而包囊浓度则未发现显著差异。每种寄生虫的水平与海拔高度没有直接关系。包囊浓度与使用供水系统的消费人群数量成比例增加。对寄生虫感染的风险评估表明，需要在小型供水系统中设置消毒装置。
