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Legionella pneumophila , a facultative intracellular bacterium, is the causative agent of legionellosis. In the environment this pathogenic bacterium colonizes the biofilms as well as amoebae, which provide a rich environment for the replication of  Legionella . When seeded on pre-formed biofilms,  L. pneumophila  was able to establish and survive and was only found at the surface of the biofilms. Different phenotypes were observed when the  L. pneumophila , used to implement pre-formed biofilms or to form mono-species biofilms, were cultivated in a laboratory culture broth or had grown intracellulary within the amoeba. Indeed, the bacteria, which developed within the amoeba, formed clusters when deposited on a solid surface. Moreover, our results demonstrate that multiplication inside the amoeba increased the capacity of  L. pneumophila  to produce polysaccharides and therefore enhanced its capacity to establish biofilms. Finally, it was shown that the clusters formed by  L. pneumophila  were probably related to the secretion of a chemotaxis molecular agent.

Intra-Amoeba Multiplication Induces Chemotaxis and Biofilm Colonization and Formation for Legionella