Previous reporting on the issue; https://www.theguardian.com/world/2021/mar/30/mystery-brain-... 'Forever Chemicals' are known to get concentrated in shellfish - I wonder if that is an issue? I'd love to see the comparative numbers of similar cases in other environments - this seems very high but I have no idea what the baseline for this sort of thing is. As someone that grew up with the spector of 'mad cow disease'…
You really should never eat shellfish from unknown sources, because these are either from unsustainable farms pumped full with chemicals to keep diseases in check or from the sea. Either way, very dirty food in more than one way. If you really gotta eat shellfish, get it from local closed-cycle industrial farms. That's of course more expensive, because you're paying for what you're getting.
Safety, processes, practices and quality vary wildly by region and farm.