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Naegleria
Infection
(nuh-GLEER-e-uh)

 

What is Naegleria?

Naegleria is a microscopic ameba commonly found in the environment. Only one species of Naegleria has been found to infect humans, Naegleria fowleri.

Where is Naegleria found?

Naegleria fowleri is found worldwide. Most commonly, the ameba is found in the soil and in warm, stagnant bodies of fresh water, such as lakes, rivers, and hot springs, unchlorinated swimming pools, and in warm wastewater pools from power plants.

How does infection with Naegleria occur?

Infections are rare. The ameba enters the body through the nose and travel to the brain and spinal cord while the person is swimming underwater or diving.

Infection is most common during the dry, hot summer months, when the temperature is above 800 F and water is warm.

What are the signs and symptoms of Naegleria infection?

Headache, fever, nausea and vomiting, stiff neck, confusion, lack of attention to people and surroundings, loss of balance and bodily control, seizures, and hallucinations are signs and symptoms of infection. Naegleria fowleri infection is also called primary amebic meningoencephalitis (PAM). Symptoms worsen; infection usually results in death within 7-10 days.

Is there treatment for infection with Naegleria?

Yes; however, most cases are fatal if not diagnosed and treated immediately.

Can infection be spread from person to person?

No.

How can I prevent an infection with Naegleria?

  • Do not swim in warm, stagnant, fresh water, such as ponds or wastewater discharge pools, or unchlorinated swimmimg pools.
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This page last reviewed February 22, 1999

Centers for Disease Control and Prevention
National Center for Infectious Diseases
Division of Parasitic Diseases