There are several parasites that can infect the urine.
Trichomoniasis is a parasite that is an STD that can rarely infect the bladder. However, seeing an actual worm from this is unlikely.
Schistosomiasis, an infection caused by a type of worm called a fluke, can affect the kidneys, ureters, and bladder.
Filariasis, a threadworm infection, can also be possible.
These options can be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
http://www.straightfromthedoc.com