Doctors investigate mystery brain disease in Canada

This reminds me that I first read about early cases of covid around october or november 2019.

"Despite patients showing no trace of any known prion diseases, it hasn't been completely ruled out as a cause, he says.

Another theory is chronic exposure to what's called an "excitotoxin" like domoic acid, which was linked to a 1987 food poisoning incident from mussels contaminated with the toxin from the nearby province of Prince Edward Island.

...

Dr Cashman says they are also looking at another toxin - beta-methylamino-L-alanine (BMAA) - which has been implicated as an environmental risk in the development of diseases like Alzheimer's and Parkinson's.

BMAA is produced by cyanobacteria, commonly known as blue-green algae."