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Quantification of cytotoxicity and virulence of environmental L. pneumophila strains towards the amoeba Acanthamoeba castellanii. Lp1 dotA : dotA mutant of Lp1 Lens; Lp1 clin: means of cytotoxicities (a) and virulences (c) of three clinical Lp1 strains (Lens, Paris and Lorraine). These means of cytotoxicities (b) and virulences (d) of three clinical Lp1 strains were compared to those of five independent pulsotypes (PST1 to PST5) of environmental Lp1 strains.
