International Centre for Cruise Research
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Guerrero, I., Genese, C, Hung, MJ, Paul, S, Ragazzoni, H, Brook, J, et al.  "Update: outbreak of Legionnaires' disease associated with a cruise ship, 1994," Morbidity and Mortality Weekly Report, 1994, 43:31 (August 12), 574-5 (Also JAMA. 1994, 272:12 (Sept 28), 915)

Four patients with atypical pneumonias admitted within a 1-week period to a community hospital were suspected and confirmed to have Legionnaires' disease. The patients had a common travel history. This cluster of cases uncovered a larger epidemic associated with cruise travel.