Legionellae are gram-negative, facultative intracellular bacteria that are responsible for sporadic and epidemic outbreaks of atypical community-acquired pneumonia (CAP)1. The clinical presentation is “atypical” in that, in addition to pneumonia, there is often extrapulmonary organ infection and a noted resistance to Beta Lactam antibiotics. The atypical CAP presentation can also occur during infection with other bacterial pathogens such as Chlamydia pneumoniae, Chlamydia psittaci, Mycoplasma pneumoniae, Francisella tularensis and Coxiella burnetii. Accurate attribution of the correct etiologic agent can, therefore, be challenging.