also  Legionnaire's disease  n :  pneumonia of a form that is caused by a bacterium of the genus Legionella (L. pneumophila), that is characterized initially by symptoms resembling influenza (as malaise, headache, and muscular aches) followed by high fever, cough, diarrhea, lobar pneumonia, and mental confusion, and that may be fatal esp. in elderly and immunocompromised individuals - see PONTIAC FEVER  .
 
 
 
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