legionella taurinensis legionella taurinensis legionella taurinensis is a gram-negative, oxidase- and catalase-positive bacterium from the genus legionella with a single polar flagellum which was isolated from a water from a hospital oxygen bubble humidifier in turin in italy. legionella taurinensis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: legionellales family: legionellaceae genus: legionella species: l. taurinensis binomial name legionella taurinensislo presti et al. 1999 type strain atcc 700508, ccug 44901, cip 106300, turin i no. 1