PDF(Pubmed)
Abstract：
Legionella concentrations in drinking water have been regulated for decades and are evaluated with regard to their concentrations in drinking water plumbing systems (DWPS). The respective action levels differ at the international level. In Germany, the Federal Environment Agency (UBA) specifies the application of ISO 11731 for the detection of legionella in drinking water and gives a binding recommendation for the methods to be used for culturing and evaluation. Effective from 01 March 2019, the UBA recommendation was revised. The utilized culture media in the culture approach were altered, consequently affecting the spectrum of legionella colonies detected in drinking water. Using data from a routine legionella monitoring of a large laboratory, over a period of 6 years and 17,270 individual drinking water samples, allowed us to assess the impact of the alteration on the assessment of DWPS. By comparing the amount of action level exceedances before and after the method change, it could be demonstrated that exceedances are reported significantly more often under the new method. Consequently, the corresponding action level for evaluation of legionella contamination and the resulting risk to human health needs to be revised to avoid the misleading impression of increased health risk.
摘要：
饮用水中的军团菌浓度已经调节了数十年，并根据其在饮用水管道系统（DWPS）中的浓度进行了评估。各自的行动级别在国际一级有所不同。在德国,联邦环境局（UBA）规定了ISO11731在饮用水中检测军团菌的应用，并为用于培养和评估的方法提供了具有约束力的建议。自2019年3月1日起，UBA建议进行了修订。改变了培养方法中使用的培养基，因此影响饮用水中检测到的军团菌菌落的光谱。使用大型实验室常规军团菌监测的数据，在长达6年的时间里，采集了17270份饮用水样本，允许我们评估更改对DWPS评估的影响。通过比较方法改变前后的行动水平超标量，可以证明，在新方法下，报告超标的频率明显更高。因此,评估军团菌污染的相应行动水平以及由此对人类健康的风险需要修订，以避免对健康风险增加的误导性印象。
