Candidatus Legionella jeonii

Candidatus Legionella jeonii is a candidatus species of bacteria from the genus Legionella. Previously known as X-bacterium, Candidatus Legionella jeonii grows symbiotically in Amoeba proteus. This endosymbiotic relationship was first noticed by Kwang Jeon and Joan Lorch in 1966.

A more recent reference dropped "Candidatus" from its name.