School of Public Health, University of São Paulo, Av. Dr Arnaldo, 715 - 1 degree andar, 01246-904, São Paulo SP, Brazil.
J Water Health. 2010 Jun;8(2):399-404. doi: 10.2166/wh.2009.172. Epub 2009 Nov 9.
The protozoan parasites Giardia and Cryptosporidium have been described as important waterborne disease pathogens, and are associated with severe gastrointestinal illnesses. The objective of this paper was to investigate the presence of Giardia cysts and Cryptosporidium oocysts in samples from watershed catchments and treated water sources. A total of 25 water samples were collected and examined according to the US EPA--Method 1623, 2005, consisting of 12 from drinking water and 13 from raw water. Positive samples from raw water for Giardia cysts and Cryptosporidium oocysts were 46.1 and 7.6%, respectively. In finished water, positive samples were 41.7% for Giardia cysts and 25.0% for Cryptosporidium oocysts. Concentrations of Giardia cysts found in raw water samples ranged from "not detected" to 3.4 cysts/L, whereas concentrations of Cryptoporidium oocysts ranged from "not detected" to 0.1 oocysts/L. In finished water, Giardia concentrations ranged from "not detected" to 0.06 cysts/L, and Cryptosporidium, from "not detected" to 0.01 oocysts/L. Concentrations of Giardia cysts and Cryptosporidium oocysts were not high in the samples analyzed. Nevertheless, the results of this study highlight the need to monitor these organisms in both raw and drinking water.
原生动物寄生虫贾第虫和隐孢子虫已被描述为重要的水源性疾病病原体，与严重的胃肠道疾病有关。本文的目的是调查水样采集区域和处理水源中是否存在贾第虫包囊和隐孢子虫卵囊。根据美国环保局 2005 年的方法 1623 ，共采集了 25 个水样，其中包括 12 个饮用水样和 13 个原水样。原水样本中贾第虫包囊和隐孢子虫卵囊的阳性检出率分别为 46.1%和 7.6%。在处理水中，贾第虫包囊的阳性检出率为 41.7%，隐孢子虫卵囊的阳性检出率为 25.0%。原水样本中贾第虫包囊的浓度范围为“未检出”至 3.4 个包囊/L，而隐孢子虫卵囊的浓度范围为“未检出”至 0.1 个卵囊/L。在处理水中，贾第虫的浓度范围为“未检出”至 0.06 个包囊/L，隐孢子虫的浓度范围为“未检出”至 0.01 个卵囊/L。分析样本中贾第虫包囊和隐孢子虫卵囊的浓度并不高。然而，本研究的结果强调了需要在原水和饮用水中监测这些生物。
