legionella brunensis legionella brunensis legionella brunensis is a gram-negative, non-spore-forming, aerobic bacterium from the genus legionella, which was isolated from cooling tower water in czechoslovakia. legionella brunensis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: legionellales family: legionellaceae genus: legionella species: l. brunensis binomial name legionella brunensiswilkinson et al. 1989 type strain atcc 43878, bcrc 17046, ccrc 17046, ccug 31114, cdc 1635-czk-e, cip 103874, dsm 19236, nctc 12240