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Legionella colonisation in hot water systems in care homes from two Danish municipalities:Legionella in Danish care homes
Legionnaires’ disease is a serious health risk among the elderly. Water systems in care homes are therefore of particular interest. We investigated the levels of Legionella in the hot water systems in care homes in two Danish municipalities. 268 water samples from 98 care homes were evaluated. Mean and median values of cultivable Legionella counts were calculated, and correlations between temperature and colony-forming units (CFU) were analysed. 77%–81% of the care homes were colonised with Legionella. Most care homes had less than 1,000 CFU/L, but 13%–16% had more than 10,000 CFU/L. When including first flush samples, 27% of the care homes in Municipality 1 had Legionella levels above 10,000 CFU/L. Temperatures of ≥ 50°Celsius in Municipality 1 and ≥ 55°Celsius in Municipality 2 correlated with low levels of Legionella in their hot water systems. The content of Legionella colonies was significantly higher in care homes in Municipality 1. However, a significantly higher proportion of taps in Municipality 2 had Legionella colonies compared to Municipality 1. In conclusion, temperatures should be raised to 55°Celsius to avoid high Legionella levels. Test procedures should be evaluated and regular use of taps and routine testing for Legionella should be taken into consideration. ; Legionnaires’ disease is a serious health risk among the elderly. Water systems in care homes are therefore of particular interest. We investigated the levels of culturable Legionella in the hot water systems in care homes in two Danish municipalities. Two hundred and sixty-eight water samples from 98 care homes were evaluated. Contents of culturable Legionella counts were calculated, and correlations between temperature and colony-forming units (CFU/L) were analysed. Seventy-seven and 81%, respectively, of the care homes were colonised with Legionella in the two municipalities. Most care homes had less than 1,000 CFU/L, but 13 and 16% had more than 10,000 CFU/L. When including first flush samples, 27% of the care homes in Municipality 1 ...
Legionella colonisation in hot water systems in care homes from two Danish municipalities:Legionella in Danish care homes
Legionnaires’ disease is a serious health risk among the elderly. Water systems in care homes are therefore of particular interest. We investigated the levels of Legionella in the hot water systems in care homes in two Danish municipalities. 268 water samples from 98 care homes were evaluated. Mean and median values of cultivable Legionella counts were calculated, and correlations between temperature and colony-forming units (CFU) were analysed. 77%–81% of the care homes were colonised with Legionella. Most care homes had less than 1,000 CFU/L, but 13%–16% had more than 10,000 CFU/L. When including first flush samples, 27% of the care homes in Municipality 1 had Legionella levels above 10,000 CFU/L. Temperatures of ≥ 50°Celsius in Municipality 1 and ≥ 55°Celsius in Municipality 2 correlated with low levels of Legionella in their hot water systems. The content of Legionella colonies was significantly higher in care homes in Municipality 1. However, a significantly higher proportion of taps in Municipality 2 had Legionella colonies compared to Municipality 1. In conclusion, temperatures should be raised to 55°Celsius to avoid high Legionella levels. Test procedures should be evaluated and regular use of taps and routine testing for Legionella should be taken into consideration. ; Legionnaires’ disease is a serious health risk among the elderly. Water systems in care homes are therefore of particular interest. We investigated the levels of culturable Legionella in the hot water systems in care homes in two Danish municipalities. Two hundred and sixty-eight water samples from 98 care homes were evaluated. Contents of culturable Legionella counts were calculated, and correlations between temperature and colony-forming units (CFU/L) were analysed. Seventy-seven and 81%, respectively, of the care homes were colonised with Legionella in the two municipalities. Most care homes had less than 1,000 CFU/L, but 13 and 16% had more than 10,000 CFU/L. When including first flush samples, 27% of the care homes in Municipality 1 ...
Legionella colonisation in hot water systems in care homes from two Danish municipalities:Legionella in Danish care homes
Nielsen, Niss Skov (author) / Uldum, Søren Anker (author)
2022-09-01
Nielsen , N S & Uldum , S A 2022 , ' Legionella colonisation in hot water systems in care homes from two Danish municipalities : Legionella in Danish care homes ' , Journal of Water and Health , vol. 20 , no. 9 , JWH-D-22-00116R1 , pp. 1393-1404 . https://doi.org/10.2166/wh.2022.116
Article (Journal)
Electronic Resource
English
DDC:
690
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