Yeah- in Hawaii, where he very well could have vacationed numerous times, there is the “Rat Lungworm” which actuslly is a brain worm that causes meningitis. Many folks have gotten it from undercooked snails or mollusks I beleive.
The worm starts out in rat lungs, then get passed out through the poo, snalis and other things get infected fro. It, and folks eat them.
Even greens in a garden can become infected when a slug crawls across them evidently.
I was the only student in the history at UTK that took a proficiency exam in parasitology and walked out with four hour credit in the 4000 level course with an “A”. There are many parasites that are not primarily human parasites that infect humans and get lost...ending up in the brain. One can be infected in a myriad of ways...ingestion or insect bites.
What he had was an egg from a pork tape worm. The worms lay eggs, travel in the blood and some land in the brain where they die and are encapsolated. They look, at first, on scans that they are brain tumors. Neurosurgeons see a lot of them these days. They are very common in Mexico and in illegals. However, Thanks to Joe Biden thousands of illegals with these tape worms now work in restaurants in the US and we risk catching them every time we eat out.