Why in the News?
A five-year-old girl admitted to the Government Medical College Hospital in Kozhikode, Kerala, has died due to primary amoebic meningoencephalitis (PAM), a rare but fatal brain infection caused by the “brain-eating amoeba” Naegleria fowleri. The case has drawn attention to this deadly pathogen and the risks associated with warm freshwater exposure.
What is Naegleria
fowleri?
●
Naegleria fowleri is a single-celled, free-living
amoeba, often referred to as the “brain-eating amoeba”.
●
First discovered in Australia in 1965, it belongs to a
genus of amoebae, but only this species infects humans.
●
Habitat: Found in warm freshwater environments such as
lakes, rivers, hot springs, and poorly chlorinated swimming pools. It thrives
particularly during hot summer months when water temperatures are higher.
● Size: Microscopic, invisible to the naked eye.
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How does it infect
humans?
●
Entry is usually through the nose when a person swims,
dives, or cleans nostrils with contaminated water.
●
The amoeba travels along the olfactory nerve to the
brain.
●
It destroys brain tissue, causing primary amoebic
meningoencephalitis (PAM).
●
Importantly, it is not communicable — it does not
spread from person to person, nor through drinking contaminated water.
What is Primary Amoebic
Meningoencephalitis (PAM)?
●
PAM is a rare and severe brain infection caused
exclusively by Naegleria fowleri.
●
Incubation period: Symptoms appear within 1–12 days
after exposure.
Symptoms (often
resemble meningitis):
1.
Early stage: Headache,
fever, nausea, vomiting.
2.
Progressive
stage: Stiff neck, seizures, confusion, hallucinations.
3.
Severe stage:
Coma and death, usually within 1–2 weeks.
Chances of Survival
●
The fatality rate is about 97% worldwide.
●
Out of hundreds of reported cases, only a handful of
patients have survived.
●
Survival depends
on:
○
Early diagnosis (often missed, as it mimics bacterial
meningitis).
○
Immediate and aggressive treatment with multiple drugs.
Treatment Options
According to the U.S. Centers for Disease Control and Prevention (CDC):
●
A combination of drugs is used, including:
○
Amphotericin B
(antifungal, mainstay drug).
○
Azithromycin,
Fluconazole, Rifampin.
○
Dexamethasone
(to reduce brain swelling).
○
Miltefosine – a
newer drug shown effective against Naegleria fowleri in lab tests and some
human survivors.
●
Despite treatment, prognosis remains very poor due to
rapid brain tissue destruction.
Prevention Measures for
Swimmers
●
Avoid swimming/diving in warm freshwater (lakes, hot
springs, ponds) unless chlorinated or properly disinfected.
●
Use nose clips or keep head above water to prevent
entry through the nostrils.
●
Maintain swimming pools properly, ensuring adequate
chlorine levels.
●
Do not use untreated tap water for nasal irrigation
(e.g., in neti pots). Always use sterile, boiled, or distilled water.
●
Personal hygiene: Wash hands with soap and water after
water-related activities.
Related Concepts
Centers for Disease
Control and Prevention (CDC)
The CDC is the national public health agency of the United States, headquartered in Atlanta, Georgia. It functions under the U.S. Department of Health and Human Services and plays a key role in disease surveillance, outbreak control, and health research.
What is an Amoeba?
●
Amoebae are single-celled eukaryotic organisms that can
alter their shape using pseudopodia (false feet).
●
They belong to the group of protozoa, but can also be
found in algae and fungi.
●
Some are harmless, while a few like Naegleria fowleri
are pathogenic.
Global Context
●
Cases of PAM are extremely rare but mostly fatal.
●
Most reported cases come from the U.S., India,
Pakistan, and other tropical regions where freshwater is warm.
●
Rising global temperatures may increase the
geographical range of Naegleria fowleri, making it a potential climate-linked
public health concern.
Conclusion
The tragic death in Kerala highlights the lethality of Naegleria fowleri and the urgent need for awareness, preventive measures, and rapid medical intervention. While infections are very rare, the mortality rate is alarmingly high, making prevention the best defense against this brain-eating amoeba.