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Mysterious brain diseases in Canada weren’t a mystery after all

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A Canadian neurologist noticed strange symptoms in a cluster of patients in New Brunswick .

The patients suffered hallucinations, spasms, rapid memory loss and the sensation that bugs were crawling underneath their skin.

Since then, neurologists who have reviewed the cases have identified clear diagnoses.

A study published this week in JAMA Neurology puts the probability of a mystery disease at roughly 1 in a million.

The study authors say 52 people identified as part of the New Brunswick cluster refused second opinions.

Neurologists with no connection to the New Brunswick cases say accurate diagnoses can take time.

Some conditions detected in the study, like Alzheimer’s, can have complex presentations.

Families sometimes miss early signs of neurodegeneration, making it appear that dementia came on suddenly.