legionella wadsworthii legionella wadsworthii legionella wadsworthii is a bacterium from the genus legionella isolated from sputum from a patient in los angeles. it can cause pneumonia in humans. legionella wadsworthii scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: legionellales family: legionellaceae genus: legionella species: l. wadsworthii binomial name legionella wadsworthiiedelstein et al. 1983 type strain atcc 33877, ccug 16415, ccug 58308, cip 103886, nctc 11532, wadsworth 81-716a