Symbiont-Mediated Defense against Legionella pneumophila in Amoebae.

is an important opportunistic pathogen for which environmental reservoirs are crucial for the infection of humans. In the environment, free-living amoebae represent key hosts providing nutrients and shelter for highly efficient intracellular proliferation of , which eventually leads to lysis of the protist. However, the significance of other bacterial players for ecology is poorly understood.