在开发一种方法来评估循环水对消费者的微生物风险时，应采用一种列举病原体的技术。在饮用水应用中，测试的典型指示生物是总大肠菌群和粪便大肠菌群。虽然这些是污染的良好指示器，但它们的尺寸相对较大（0.1-10微米）。信息收集规则（ICR）建议使用MS-2噬菌体作为指示生物，因为其大小和形状与人类肠道病毒相似，但不是人类病原体。本文分析了一种用于浓缩和计数本土大肠杆菌噬菌体的膜过滤方法，作为通过低压和高压膜系统监测病毒去除的一种方法。包括8个参考文献、表格、图表和附录。

In developing a methodology to assess microbial based risk to consumers from recycled water, a technique to enumerate pathogens should be employed. In drinking water applications the typical indicator organisms tested for are total and fecal coliform. While these are good indicators of contamination, they are relatively large in size (0.1-10 microns). The Information Collection Rule (ICR) has recommended the use of MS-2 bacteriophage as an indicator organism as it is similar in size and shape to human enteric viruses, but is not a human pathogen. This paper analyzes a membrane filtration method for the concentration and enumeration of indigenous coliphage as a way to monitor virus removal through low and high pressure membrane systems. Includes 8 references, tables, figures, appendix.