Environmental and public health experts are warning about a hidden threat in water systems, free-living amoebae. These microscopic organisms are often overlooked, but some species can pose serious risks to human health. A recent perspective published in Biocontaminant highlights the growing concern over these pathogens.

Amoebae are single celled organisms found naturally in soil and water. Most are harmless, but a few species can cause severe infections in humans. One such species is Naegleria fowleri, commonly known as the “brain eating amoeba.” This organism can cause a rare but almost always fatal infection if contaminated water enters the nose, often during swimming or diving.

According to Longfei Shu, a researcher at Sun Yat-sen University and the study’s corresponding author, free-living amoebae can survive conditions that kill many other microbes. They can withstand extreme temperatures and persist in chlorinated water systems.

This resilience is concerning because it means these organisms can survive in environments that are typically considered safe.

Another risk is the “Trojan horse effect.” Free living amoebae can act as hosts for other pathogens, including bacteria and viruses. These pathogens can survive inside amoebae, making them harder to eliminate through standard disinfection processes.

Researchers suggest this phenomenon may contribute to the rise of antibiotic resistance, as pathogens sheltered inside amoebae may evade treatment and spread more easily.

Rising global temperatures may expand the range of heat-tolerant amoebae into regions where they were previously uncommon. Climate change is altering ecosystems, and outbreaks linked to recreational water exposure have raised public concern in several countries.

The study’s authors recommend a “One Health” approach, integrating public health, environmental research, and water management. They emphasize the need for improved surveillance, better diagnostic tools, and advanced water treatment technologies.

“Amoebae are not just a medical issue or an environmental issue,” Shu said. “They sit at the intersection of both, and addressing them requires integrated solutions that protect public health at its source.”

Local Risks and Prevention

These threats are not limited to remote areas. In the U.S., several cases of Naegleria fowleri infection have occurred in warm freshwater lakes and hot springs. Poorly maintained pools and hot tubs can also become breeding grounds for dangerous organisms.

Staying informed about local water quality and avoiding stagnant or untreated water sources can reduce risk.

To protect yourself:

•Be aware of local water conditions, especially in areas with known amoeba activity.

•Follow guidelines for swimming and recreational water use.

•Ensure pools and water facilities are properly maintained and treated.

•Advocate for improved water management and monitoring in your community.

Free living amoebae are a reminder that human health is closely connected to the environment. As climate change continues to affect ecosystems, risks from pathogens like amoebae may increase. Staying informed, taking precautions, and supporting better water management can help protect communities and future generations.

Credits Original Study Jianyi Zheng,Ruiwen Hu,Yijing Shi,Zhenzhen He,Longfei Shu (The rising threat of amoebae: a global public health challenge)