Ya basically all ghost shrimp are wild caught so it's not uncommon to get a shrimp with a nematode or some other type of intestinal worm parasite in it. I had one with a nematode in it and I planned on taking him out of the tank, but never got around to it. He later died and was eaten by my spotted raphael catfish. There's nothing wrong with my catfish so I guess the nematode wasn't passed to my catfish.