Prevention of Legionella infections from toilet flushing cisterns
Published on 02/21/2024 |
by Waterline Admin
Bechmann L, Bauer K, Zerban P, Esser T, Tersteegen A, Fuchs SA, Kaasch AJ, Wolleschak D, Schalk E, Fischer T, Mougiakakos D, Geginat G. J Hosp Infect. 2024 Jan 13:S0195-6701(24)00010-0. doi: 10.1016/j.jhin.2023.12.016. Epub ahead of print. PMID: 38224856.
Highlights
This study reports an investigation following a fatal case of hospital-acquired legionellosis linked to contaminated water from a toilet-flushing cistern.
Legionella spp. were monitored in the building’s hot and cold-water systems using culture. Molecular typing of L. pneumophila isolates was also performed on samples from the infected patient and the water.
Legionella contamination in the hospital building’s cold-water system was significantly higher than in the hot water system and significantly higher in toilet flushing cistern’s water compared to cold water from bathroom sinks and showers.
Isolates from the patient and from the flushing cistern of the patient’s bathroom were identical by molecular typing.
In an experimental setting, daily toilet flushing for a period of 21 days resulted in a 67% reduction in the growth of Legionella spp. in the water of toilet flushing cisterns.
A one-time disinfection of cisterns with peracetic acid, followed by daily flushing, decreased legionella growth to less than 1% over a period of at least 7 weeks in these settings.
The paper can be sourced here