This is actually a very common problem in 3rd world places with sewage in the drinking water. This worm is a vary common cause of seizures in places like Mexico, and now here, since they have all migrated here.
Or pigs with access to human feces. Probably from Central America or Africa although there was a case recently of tapeworm cysts in the brain of a man with a predilection for undercooked bacon. Kennedy is fortunate if his only symptoms were mental fog.