期刊
PATHOGENS
卷 5, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/pathogens5020035
关键词
legionellosis; sanitary hot water; temperature diagnostic; Legionella pneumophila; culture; quantitative polymerase chain reaction; copper concentration; hospital premise plumbing
类别
Following nosocomial cases of Legionella pneumophila, the investigation of a hot water system revealed that 81.5% of sampled taps were positive for L. pneumophila, despite the presence of protective levels of copper in the water. A significant reduction of L. pneumophila counts was observed by culture after heat shock disinfection. The following corrective measures were implemented to control L. pneumophila: increasing the hot water temperature (55 to 60 degrees C), flushing taps weekly with hot water, removing excess lengths of piping and maintaining a water temperature of 55 degrees C throughout the system. A gradual reduction in L. pneumophila counts was observed using the culture method and qPCR in the 18 months after implementation of the corrective measures. However, low level contamination was retained in areas with hydraulic deficiencies, highlighting the importance of maintaining a good thermal regime at all points within the system to control the population of L. pneumophila.
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