本研究的主要目的是探讨在饮用水分配系统中残留消毒剂的情况下，病原体存活和持续存在的机制。实验旨在评估指示生物（大肠杆菌）顺序接触消毒剂的作用。E、 使用大肠杆菌是因为它是饮用水中粪便污染的常见指示生物。连续暴露将模拟交叉污染事件，其中微生物被引入分配系统并暴露于消毒剂残留中，随后消毒剂损失一段时间，然后再次暴露。包括6个参考文献、图。

The main objective of this study was to investigate the mechanismsthat contribute to the survival and persistence of pathogens in the presence of a disinfectant residual in drinking water distribution systems. Experiments were designed to assess the role of sequential exposure of the indicator organism (E. coli) to disinfectants. E. coli is used because it is a common indicator organism for fecal contamination in drinking water. Sequential exposure will simulate the event of cross contamination where microorganisms are introduced into a distribution system and are exposed to the disinfectant residual, followed by loss of the disinfectant for a period of time, and then re-exposure. Includes 6 references, figures.