Candidatus Legionella jeonii is a candidatus species of bacteria from the genus Legionella.[2][1] Previously known as X-bacterium,[3]Candidatus Legionella jeonii grows symbiotically in Amoeba proteus.[4] This endosymbiotic relationship was first noticed by Kwang Jeon and Joan Lorch in 1966.[5][3]
A more recent reference[6] dropped "Candidatus" from its name.
^ abPark, M; Yun, ST; Kim, MS; Chun, J; Ahn, TI (December 2004). "Phylogenetic characterization of Legionella-like endosymbiotic X-bacteria in Amoeba proteus: a proposal for 'Candidatus Legionella jeonii' sp. nov". Environmental Microbiology. 6 (12): 1252–63. doi:10.1111/j.1462-2920.2004.00659.x. PMID15560823.