legionella tucsonensis legionella tucsonensis legionella tucsonensis is a gram-negative bacterium from the genus legionella with a single polar flagellum, which was isolated from the pleural fluid of a renal transplant patient with immunosuppressive therapy in tucson, arizona. legionella tucsonensis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: legionellales family: legionellaceae genus: legionella species: l. tucsonensis binomial name legionella tucsonensisthacker et al. 1990 type strain 1087-az-h, atcc 49180, ccug 31119, cip 105113, dsm 19246, nctc 12439