b/c he lives someplace where people get parasites regularly? Also b/c it is cheaper and easier to treat for parasites (take a pill) than to test and then treat (visit a doctor, get a prescription, take a pill).
Many parasites are endemic to the southern USA. As a child I was checked for parasites every year. Most modern doctors I've met are negligent in this regard. Under questioning several have stated that it is unimportant. Some doctors assert incorrectly that blood tests would reveal any significant parasitic infestation. I always correct them but I also change doctors b/c medical school seems to "harden" the brain - nothing new can be learned once they have graduated.
Ever walk barefoot across the lawn?
Ever eat uncooked fish/flesh/sushi?
Ever own/pet a cat?
If so, you might want to get tested!8-))
Neglected Parasitic Infections: What Family Physicians Need to Know—A CDC Update:
Ever walk barefoot across the lawn?
In my case it was getting mud into my mud boot from interacting with an aggressive horse. It took me a while to figure out the thing on my foot was not fungal but a parasite. Ivermectin horse paste cleared it up but I also have FenBen just in case I missed one. Most of them exited on their own after applying acetic acid.
> Ever own/pet a cat?
As far as i know, current medical advice is not to treat toxoplasmosis (except in exceptional situations like if you have AIDs) so im not sure what the benefit of getting tested would be.
Unless you mean other parasites.
At least in the US parasite risk from sushi is very low because nearly all seafood sold/served is put through a deep freeze cycle.
But if you're slicing up something you just caught that could be an issue. It's a concern with hunting/game as well. Most people who get trichinosis in the US get it from eating bear apparently.