legionella quateirensis legionella quateirensis legionella quateirensis is a gram-negative bacterium from the genus legionella which was isolated from a shower in a hotel bathroom in quarteira, portugal. legionella quateirensis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: legionellales family: legionellaceae genus: legionella species: l. quateirensis binomial name legionella quateirensisdennis et al. 1993 type strain atcc 49507, ccug 44899, cip 105271, nctc 12376, thacker 1335