"Where da fish at?"
There are certain species of large worms that can live inside humans...
One such worm, Immanis Maximus, can be extremely difficult to eliminate or extract from the body.
In extreme cases the patient is put on a gurney, laying on the stomach. The physicians will prop open the patients mouth and set some raw meat just outside the mouth. When the worm starts to exit the mouth towards the meat, the physician literally grabs the worm and pulls it from the patient.
This is followed by treatments of antibiotics.