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Paucis Verbis: Legionella pneumonia

Posted Sep 16 2011 12:00am

Did you know that there was an unexplained spike in Legionnaire's disease (pneumonia caused by Legionella pneumophila) during the 2009 H1N1 flu pandemic?

Since the flu season is rapidly approaching, I thought I would review what Legionnaire's disease looks like. Yes, they will have a fever, cough, and pneumonia on CXR. These patients are generally pretty sick and almost always need hospitalization. What makes it unique? The trick is to look for extrapulmonary findings, which help to distinguish it from other atypical pneumonias. Relative bradycardia is a sure tip.

Why do we want to differentiate it from other pneumonias?
Legionnaire's disease requires reporting to your state's health department to help track for outbreaks.



You can download this PV card:  [ MS Word ] [ PDF ] See  other Paucis Verbis cards .

More information on Legionellosis from the CDC website .

Reference
Cunha BA. Legionnaires' disease: clinical differentiation from typical and other atypical pneumonias. Infect Dis Clin North Am. 2010 Mar;24(1):73-105. PMID: 20171547


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