Alier Marrero
Dr. Alier Marrero is a neurologist who has brought attention to a cluster of neurological symptoms of unknown origin affecting individuals in New Brunswick. His advocacy for investigating potential environmental factors, such as high pesticide levels, has been crucial in prompting further government inquiry into the cases, leading to renewed analysis of the situation in the province.
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Recent news mentions
Dr. Alier Marrero is a New Brunswick neurologist who is calling for an independent investigation into undiagnosed neurological illnesses affecting patients.
New Brunswick doctor renews call for investigation into undiagnosed neurological illness
Canada· 2026-02-19
Alier Marrero is a neurologist in New Brunswick who raised concerns about a growing number of patients with undiagnosed neurological illness.
New Brunswick report finds no environmental links to unknown neurological illness in patientsCanada· 2026-01-23
Alier Marrero is a neurologist who has been investigating a cluster of patients with unexplained neurological symptoms in New Brunswick.
The battle over Canada's mystery brain disease
United Kingdom· 2026-01-11
Alier Marrero is a Moncton-based neurologist involved in diagnosing cases related to a suspected neurological syndrome in New Brunswick.
Canada medical mystery takes twist as study finds no evidence of brain illness | CanadaUnited Kingdom· 2025-05-09
Alier Marrero, the patients’ neurologist, raised concerns about the review’s methodology and conclusions.
No evidence to support neurological syndrome of unknown cause in New Brunswick, study findsCanada· 2025-05-07
Alier Marrero is a neurologist who has been raising alarm about elevated levels of heavy metals and pesticides in test results of patients.
New Brunswick launches second probe into mystery brain symptomsCanada· 2025-03-28
The cases were brought to the attention of authorities by a single neurologist – Dr. Alier Marrero – who had suggested the illness was caused by environmental factors such as elevated levels of pesticides.
New Brunswick to begin review of mystery brain disease cases, Chief Medical Officer saysCanada· 2025-03-27