本研究比较了同时检测水中贾第虫和隐孢子虫的免疫荧光（IFA）方法与硫酸锌浮选法和卢格尔碘法。结果表明，IFA技术在地表水样中检测到的贾第鞭毛虫囊肿约为硫酸锌法的12倍。此外，在几个样本中检测到隐孢子虫。寄生虫检测方法的含义将根据地表水处理规则进行讨论。包括45个参考文献和表格。

This study compared an immunofluorescence (IFA) method for the simultaneous detection of Giardia and Cryptosporidium in water to the zinc sulfate flotation and Lugol's iodine method. The results show that the IFA technique detected approximately 12 times more Giardia cysts in surface-water samples than the zinc sulfate method. In addition, Cryptosporidium was detected in several samples. The implications of parasite detection methodology are discussed in relation to the Surface Water Treatment Rule. Includes 45 references, tables.