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Living with Amoebiasis due to free-living amoebae

Infections caused by free-living amoebae found in water, which can affect the brain and nervous system.

Understanding Amoebiasis due to free-living amoebae

Amoebiasis due to free-living amoebae is a group of infections caused by amoebae such as Naegleria, Acanthamoeba, Balamuthia, and Sappinia.

Naegleria fowleri causes an acute central nervous system infection called primary amebic meningoencephalitis (PAM). Acanthamoeba and Balamuthia can cause granulomatous amebic encephalitis (GAE) in people with weakened immune systems. Sappinia pedata has been tied to a case of amebic encephalitis. These amoebae are commonly found in lakes, swimming pools, tap water, and heating and air conditioning units.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Fever
  • Headache
  • Sensitivity of the eyes to light
  • Brain inflammation (encephalitis)
  • Changes in behavior
  • Abnormal findings on brain imaging

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with rare disease patient organizations for support
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Which amoeba caused my infection?
How could I have been exposed?
Which specialists, such as an infectious disease doctor, should be on my care team?

Quick facts

Symptoms usually startany time in life

GARD says it is caused by free-living amoebae, which live in places like lakes, swimming pools, and tap water. Some types cause disease mainly in people with weakened immune systems.

Infectious

Also known as: free-living ameba infection; specific infections by free-living amebae

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Amoebiasis due to free-living amoebaeGARD ID 12650 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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