Schulze-Röbbecke R, Jung K D, Pullmann H, Hundgeburth J
Hygiene-Institut, Universität Bonn.
Zentralbl Hyg Umweltmed. 1990 May;190(1-2):84-100.
A number of measures were taken to control Legionella pneumophila in a hospital hot water system over a period of 18 months, including (i) raising the temperature of the water leaving the central storage tanks from initially 55-60 degrees C to approximately 73 degrees C, (ii) heat shock treatment of the whole system with water temperatures above 70 degrees C and (iii) increasing the daily return flow from the hospital circulation system from initially 30 m3 to 120 m3. In addition, (iv) three UV irradiation devices were installed on the inlet and outlets of the storage tanks and (v) an attempt was made to decontaminate the water system by means of CO2. Measures (i) and (iii) were demonstrated to be effective for permanent control of Legionellae in the system. Measures (ii) and (v) proved to have only a short term effect of several days and measure (iv) did not show any effect on the presence of Legionellae at all. The extent of Legionella contamination of the water samples correlated negatively with water temperature and depended on the position of the outlets within the hospital. Different pipe materials (copper, plastics) could not be shown to have any influence on the extent of water contamination with Legionella. The findings of the survey indicate that especially the peripheral areas of the hot water system were colonized by Legionellae.
在18个月的时间里，采取了一系列措施来控制医院热水系统中的嗜肺军团菌，包括：（i）将离开中央储水箱的水温从最初的55 - 60摄氏度提高到约73摄氏度；（ii）用高于70摄氏度的水温对整个系统进行热休克处理；（iii）将医院循环系统的每日回流量从最初的30立方米增加到120立方米。此外，（iv）在储水箱的进出口安装了三台紫外线照射装置；（v）尝试通过二氧化碳对水系统进行消毒。措施（i）和（iii）被证明对系统中军团菌的长期控制有效。措施（ii）和（v）仅在几天内有短期效果，措施（iv）对军团菌的存在没有任何影响。水样中军团菌的污染程度与水温呈负相关，并取决于医院内出水口的位置。不同的管道材料（铜、塑料）对军团菌水污染程度没有任何影响。调查结果表明，特别是热水系统的外围区域被军团菌定植。
