由于在消毒试验中确定贾第鞭毛虫灭活的标准方法——包括计算死亡和活生物体——可能非常繁琐，因此正在寻找另一种方法，即只估计活的滋养体的浓度。本文介绍了这种容量法的发展，并通过与标准法和容量法的结果进行比较，对其进行了验证。这项工作表明，这两种方法产生的结果相当——至少对所检查的消毒剂和水是如此。这种等效性是否适用于更大规模的浓缩技术以及不同的水、消毒剂和生物体，仍有待进一步研究。包括13个参考文献、表格、图表。

Because the standard method of determining Giardia inactivation in disinfection tests--which involves counting dead and living organisms--can be extremely tedious, an alternative method, whereby the concentration of only viable trophozoites is estimated, is being sought. This article describes the development of such a volumetric method and its verification by comparing the results obtained with the standard and volumetric methods. This work demonstrates that the two methods yield equivalent results--at least for the disinfectants and waters examined. Whether this equivalence operates for larger-scale concentration techniques and for different waters, disinfectants, and organisms remains open to further research. Includes 13 references, tables, figures.