Preliminary report on the pathogenicity of Legionella pneumophila for freshwater and soil amoebae.

Initial studies with seeded material indicate that amoebal enrichment could be utilised for the isolation of legionellae from clinical specimens and natural habitats, and it is suggested that a vacuole, orAmoeba, full of Legionellae, rather than free legionelae, could be the infective particle for man.