legionella parisiensis legionella parisiensis legionella parisiensis is a gram-negative bacterium from the genus legionella which was isolated from cooling tower water in paris. legionella parisiensis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: legionellales family: legionellaceae genus: legionella species: l. parisiensis binomial name legionella parisiensisbrenner et al. 1985 type strain atcc 35299, ccug 29670, cip 103847, dsm 19216, jcm 7561, nctc 11983, pf-209c-c2