What time of year is Legionnaires disease most likely?
A recent study estimated that the true number of Legionnaires' disease cases may be 1.8–2.7 times higher than what is reported. More illness is usually found in the summer and early fall, but it can happen any time of year.
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Legionnaires' disease, the pneumonic form, has an incubation period of 2 to 10 days (but up to 16 days has been recorded in some outbreaks). Initially, symptoms are fever, loss of appetite, headache, malaise and lethargy. Some patients may also have muscle pain, diarrhoea and confusion.