Risk Factors for Legionnaires' disease


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About risk factors: Risk factors for Legionnaires' disease are factors that do not seem to be a direct cause of the disease, but seem to be associated in some way. Having a risk factor for Legionnaires' disease makes the chances of getting a condition higher but does not always lead to Legionnaires' disease. Also, the absence of any risk factors or having a protective factor does not necessarily guard you against getting Legionnaires' disease. For general information and a list of risk factors, see the risk center.

Risk factor list: The list of risk factors mentioned for Legionnaires' disease in various sources includes:

Risk factors discussion: Relative humidity, temperature, and other environmental factors can alter the incidence and the fatality rates of infectious diseases, including Legionnaires' disease. For example, cooling towers and evaporative condensers of large air conditioning systems have been associated with outbreaks of the disease, and the highest incidence of Legionnaires' disease occurs in the warmest months of the year, the time when air conditioning systems are used the most.1

The elderly, cigarette smokers, persons with chronic lung or immunocompromising disease, and persons receiving immunosuppressive drugs.2

Footnotes:
1. excerpt from Legionnaires' Disease: NIEHS_1
2. excerpt from Legionellosis: DBMD

Last revision: May 30, 2003

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