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The pictured magazine covers feature the work of public health professionals in 1976 as they raced to trace the origin of the first documented outbreak of Legionnaire’s disease in Philadelphia, Pennsylvania.

The pictured magazine covers feature the work of public health professionals in 1976 as they raced to trace the origin of the first documented outbreak of Legionnaires' disease in Philadelphia, Pennsylvania.

Legionnaires' disease (LEE-juh-nares) is caused by a type of bacterium called Legionella (LEE-juh-nell-a). The bacterium is named after a 1976 outbreak, when many people who went to a Philadelphia convention of the American Legion suffered from this disease, a type of pneumonia (lung infection). A milder infection, also caused by Legionella bacteria, is called Pontiac fever. The term "legionellosis" (LEE-juh-nuh-low-sis) may be used to refer to either Legionnaires' disease or Pontiac fever.

For Clinicians

Top 10 things clinicians need to know - legionellosis.

Top 10 things every clinician needs to know about legionellosis including diagnosing, testing, obtaining a specimen for culture, treating, and reporting cases.

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ELITE Program

CDC's ELITE Program

The Environmental Legionella Isolation Techniques Evaluation (ELITE) Program was created as a way for laboratories to test their Legionella isolation techniques against standardized samples.

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