Mexico closes six artificial lakes in Merida after amoeba detection

Authorities in the Mexican state of Yucatán have closed six artificial lakes in the city of Mérida following the detection of Naegleria fowleri, a parasite commonly referred to as the "brain-eating amoeba." The closures were ordered by the Yucatán State Health Service (SSY) after laboratory tests confirmed the presence of the organism in six of nine urban water features inspected across the city.

Detection and Closures

The decision to restrict access to the water bodies was triggered by the death of a 34-year-old man in September. The victim, a water sports instructor, died from a brain infection caused by Naegleria fowleri after working at an artificial lake in the Plaza La Isla area where the pathogen was later detected.

According to Yucatán’s Health Minister Alberto Alcocer, single-celled organisms of the genus Naegleria were found in six of the nine bodies of water tested. The affected sites include the artificial lake at La Isla, a smaller body of water in Cabo Norte, Parque Ecologico de Oriente, and lakes at both El Centenario Zoo and La Plancha. The remaining three tested sites returned negative results.

Physical barriers and warning signs have been installed at the restricted locations to prevent public access. Municipal, federal, and private operators have begun chemical sanitation protocols under the technical guidance of specialists from the Autonomous University of Yucatán and the Center for Research and Advanced Studies.

Public Health Measures and Monitoring

Following the initial incident, medical surveillance teams monitored hundreds of individuals who had potential exposure to the contaminated water. According to the SSY, 361 people who had contact with the lake's water source completed their medical monitoring period on October 4 without any further cases of illness being recorded.

Health officials emphasized that the parasite is transmitted only when contaminated water is forced high into the nasal cavity. It cannot be contracted through casual contact, surface splashes, or drinking tap water. Consequently, the surrounding parks and zoological grounds remain open to visitors, provided they maintain a minimum distance of 3 meters from the water's edge at lakes that have tested positive.

Authorities clarified that none of the nine inspected sites are designed or approved for swimming or recreational bathing, as they function strictly as ornamental urban features. Boat tours at sites like Animaya continue because visitors have no direct contact with the water.

National Review and Misinformation

In response to the findings, Mexico's Ministry of Health is planning to conduct a comprehensive review of all artificial lakes at risk of contamination with Naegleria fowleri, particularly those located within amusement parks. The SSY stated it will continue to inspect artificial lakes in Yucatán State to address potential risks and protect public health.

Despite official clarifications, health authorities noted that social media posts have exaggerated the risks. Some online users have spread conspiracy theories, including claims that the amoeba was planted by political opponents or that the public water supply is unsafe. Officials reiterated that the amoeba does not threaten people engaged in everyday or leisure activities and that the disease is not transmitted from person to person.

Why it matters

The closures highlight the risks associated with stagnant warm water features in subtropical regions, where Naegleria fowleri is prevalent. While infections are extremely rare, they are almost always fatal, causing primary amoebic meningoencephalitis. The incident underscores the importance of water quality monitoring in urban recreational spaces and the need for accurate public health communication to prevent panic and misinformation.

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Sources

• bluewin.ch: Deaths Caused by “Brain-Eating Amoeba” — Lakes in Mexico Closed
• yucatanmagazine.com: Deadly Brain-Eating Amoeba Detected in 4 More Artificial Lakes in Mérida
• vietnam.vn: Mexico bans people from swimming in six artificial lakes after brain-eating amoebas are found in them.

This article was drafted with AI assistance and checked against the sources above. Company claims are reported as claims. Cover image is AI-generated.