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N.B. investigation finds no evidence of environmental cause of neurological illnesses

Brian Owens · January 23, 2026 ·

There is no evidence that the apparent cluster of undiagnosed neurological illnesses in New Brunswick is caused by environmental contaminants, according to the results of an investigation by the province’s Chief Medical Officer of Health.

“Our findings do not suggest widespread exposure to herbicides or metals that would be a contributing factor to these illnesses,” Dr. Yves Léger said at a press conference in Fredericton on 23 January. Read more in The Courier.

CHCO/The Courier mystery brain disease, New Brunswick

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