What Causes of Legionnaires ?
Legionnaires' disease, also called Legionellosis is a lung infection, a form of pneumonia which can be fatal, caused by the legionella bacterium. The name Legionnaires' disease emerged in 1976 - in July there was an outbreak of pneumonia among delegates at a convention of the American Legion in Philadelphia. In January of the following year, the causative agent was identified as a previously unknown bacterium, which was subsequently named Legionella.
Most cases of Legionnaires' disease occur as single isolated cases, not linked to any recognized outbreak, despite the infection's significant media attention. If outbreaks do occur, they tend to do so in the summer or early autumn; but they may occur at any time of year.
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