Archive · 28 Jan 2026
Scientists Warn of Rising Free-Living Amoeba Threat
Scientists are worried about tiny organisms called free-living amoebas that live in water and soil.
Some of these amoebas can make people very sick, especially one called Naegleria fowleri, which can cause a serious brain infection.
This usually happens when contaminated water goes up the nose.
The problem is getting worse because of climate change, which makes the water warmer and helps these amoebas grow.
They can also survive in treated water because they are resistant to disinfectants like chlorine.
Even more concerning, these amoebas can protect harmful bacteria and viruses inside them, making it harder to keep water safe.
Scientists say we need better ways to detect and treat these amoebas to protect people's health.
Free-living amoebas (FLAs) are emerging as a global health concern due to their ability to survive extreme environments and evade standard water treatment methods.
Naegleria fowleri, a pathogenic species, can cause primary amoebic meningoencephalitis (PAM), a rare but nearly always fatal brain infection.
Climate change and deteriorating infrastructure are extending the geographic range of heat-tolerant FLAs, making them more prevalent in recreational and domestic water supplies.
FLAs can resist standard disinfectants like chlorine, colonise biofilms, and evade purification, making traditional water treatment measures less effective.
FLAs can act as protective hosts for dangerous bacteria and viruses, sheltering them within their cells and enabling their spread through water systems.
- Who
- Environmental and public health scientists, led by Longfei Shu of Sun Yat-sen University
- What
- Rising threat of free-living amoebas to global health
- When
- Ongoing concern with increasing risks due to climate change and infrastructure issues
- Where
- Global, with specific mentions of regions like Kerala, India
- Why
- Amoebas can cause fatal infections, resist disinfection, and shelter harmful pathogens
- Organisms
- Free-living amoebas (FLAs)
- Pathogenic Species
- Naegleria fowleri
- Disease
- Primary amoebic meningoencephalitis (PAM)
- Transmission
- Contaminated water entering nasal passages
- Risk Factors
- Climate change, deteriorating infrastructure, inadequate monitoring
- Protection for Pathogens
- Amoebae can shelter bacteria and viruses
- Examples of Harboured Bacteria
- Legionella pneumophila
- Disinfection Resistance
- Resistant to chlorine and other standard disinfectants