Highlights

•    Similar L. pneumophila concentrations in hospital faucets and hot water system pipes.
•    Hot water temperature increase: determining factor for Lp levels in water.
•    Dominance of two STs in first draw and flushed samples in building hot water.
•    Minimal impact of local conditions on strain selection and ST distribution.
•    Ability of STs to multiply in host cells and tolerate copper and high temperatures.

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