A landmark joint study by ICMR and the Kerala Health Department provides the first scientific evidence that non-chlorinated well water is a primary driver of Amoebic Meningoencephalitis (AME) cases in the state.

  • Using non-chlorinated well water for domestic purposes increases AME risk by 2.95 times.
  • The majority of 2025 cases were caused by Acanthamoeba, contrary to popular belief about Naegleria fowleri.
  • Removing non-chlorinated well water as a risk factor could prevent 34.2% of AME cases.

A pioneering field-level study conducted by the Kerala Health Department and experts from ICMR’s National Institute of Epidemiology (NIE) has uncovered a critical link between domestic water use and Amoebic Meningoencephalitis (AME). The research provides the first epidemiological evidence in Kerala that exposure to natural water bodies and the use of non-chlorinated water for bathing and facial washing are significant, modifiable risk factors for this devastating neurological condition.

The case-control study highlights a systemic vulnerability in Kerala's water infrastructure. According to the findings, individuals utilizing well water for bathing or washing their face had 2.95 times higher odds of contracting AME. This is particularly alarming given that a vast segment of the population relies on individual or public wells rather than treated, piped water supplies. The researchers emphasized that the risk is associated with direct contact with the face, head, and skin, rather than ingestion.

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Why This Matters

BozokMedia analysis shows that this study shifts the narrative from rare 'outbreaks' to a chronic public health failure regarding water quality. The proliferation of free-living amoebae (FLAs) in poorly maintained wells is exacerbated by heavy rainfall, flooding, and sewage contamination. This indicates that without institutionalized, year-round water quality surveillance and chlorination by local self-governments, the population remains at constant risk.

"The finding that the use of non-chlorinated water is independently associated with AME is quite relevant for Kerala, where only a tiny fraction of the population has access to chlorinated, safe, piped water supply." - Dr. R. Aravind, Head of Infectious Diseases, Thiruvananthapuram Government Medical College.

The study, published in the CDC journal Emerging Infectious Diseases, analyzed 159 cases reported between January and November 2025. The results revealed a critical distinction in the causative agents: 88.2% of PCR-confirmed cases were caused by Acanthamoeba, while only 11.8% were due to the widely feared Naegleria fowleri (the 'brain-eating amoeba'). This suggests that public and media perception has been skewed toward the rarer species while ignoring the more prevalent Acanthamoeba.

Amoeba Species Confirmed Cases (%) Case Fatality Rate (%)
Acanthamoeba 88.2% 25.4%
Naegleria fowleri 11.8% 44.4%

The surge in reported cases—from 45 cases between 2016-2024 to 159 in a single year—is attributed to increased clinical awareness and the wider availability of molecular diagnostics. However, the case fatality rate remains high at 25.8%, underscoring the urgency of preventive measures, especially during the monsoon and post-monsoon periods.

Did You Know?: Amoebae can enter the body not only through the nasal passage but also through skin ulcers or open wounds, making hygiene during water exposure critical.

Frequently Asked Questions

Q1: Is drinking well water the primary cause of AME?
A: No, the study specifies that the risk is linked to domestic activities involving direct contact with the face, head, or skin, such as bathing or washing hair.

Q2: How can households reduce the risk of infection?
A: Routine chlorination of domestic water sources and avoiding diving or snorting water in unchlorinated natural water bodies are the most effective preventive measures.