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Español: Diagnóstico

Legionnaires’ Disease

People with Legionnaires' disease have pneumonia (lung infection) since Legionella grow and thrive in the lungs. Pneumonia is confirmed either by chest x-ray or with a physical exam.

Healthcare professionals can also find Legionella in the body by doing a

  • Urine (pee) test
  • Laboratory test that involves taking a sample of sputum (phlegm) or a lung biopsy

Pontiac Fever

Pontiac fever is a form of infection with Legionella that does not involve pneumonia. Patients can have fever, headache, and body aches for a few days but improve without antibiotic treatment. Healthcare professionals can use a urine or blood test to see if someone has Pontiac fever. However, a negative test doesn’t rule out that someone may have it (this is called a false negative). Healthcare professionals most often diagnose Pontiac fever when there are other known laboratory-confirmed legionellosis cases (either Legionnaires’ disease or Pontiac fever).

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