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Resistance of Legionella strains to heat shock for 30 min at 70°C. Letters refer to the three water circuits contaminated by strains of L. pneumophila sg1. Bars correspond to the different strains presented in Fig. 1. For water circuit B, two successive heat resistance profiles were observed: cluster B1 for strains isolated from 1992 to 1994 and cluster B2 for strains isolated from 2000 to 2008.
