“…a combined outbreak of Pontiac fever and legionnaires disease at a hotel in Oklahoma City, Oklahoma, associated with exposure to a poorly maintained hot tub. Ninetyâ€five percent of the mostly adolescent 107 ill people had Pontiac fever, and the remainder had legionnaires disease.”
Most aerosolized sources of bacterialâ€contaminated warm water, including whirlpool spas, warm spring pools, decorative fountains, cooling towers, and industrial cleaning systems that use highâ€pressure water, have been linked to outbreaks of Pontiac fever.
Because the hot tub had been heavily disinfected before analysis by investigators, the results of hot tub water cultures were negative, but the results of PCR for L. pneumophila were positive. As in many outbreaks, a minority (46%) of persons with Pontiac fever had elevated L. pneumophila antibodies.
http://www.journals.uchicago.edu/doi/full/10.1086/510394
