Survival of <i>Legionella pneumophila</i> within cysts of <i>Acanthamoeba polyphaga</i> following chlorine exposure

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<jats:p>The association between <jats:italic>Legionella pneumophila</jats:italic> and the free‐living amoeba <jats:italic>Acanthamoeba polyphaga</jats:italic> was studied. Intracellular growth of <jats:italic>L. pneumophila</jats:italic> within amoebic trophozoite was confirmed by kinetic growth experiments, light and electron microscopy. Cysts produced from infected trophozoites were found to protect the legionellas from at least 50 mg/l free chlorine. The ability of <jats:italic>L. pneumophila</jats:italic> to survive within the cysts of <jats:italic>A. polyphaga</jats:italic> is suggested as a possible mechanism by which the organism evades disinfection and spreads to colonize new environments.</jats:p>

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