legionella drancourtii legionella drancourtii legionella drancourtii is a gram-negative bacterium from the genus legionella which occurs in nature as a strictly intracellular parasite of free-living amoebae. l. drancourtii is named after michel drancourt. legionella drancourtii scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: legionellales family: legionellaceae genus: legionella species: l. drancourtii binomial name legionella drancourtiila scola et al. 2004 type strain atcc 50991, ccug 111, llap 12