Success! In Clinical Laboratory Science – Bacteriology Practice Test

Hematuria is a typical sign of human infection caused by which parasite?

Trypanosoma cruzi Trichinella spiralis Trichomonas vaginalis Schistosoma haematobium

Correct Answer:

Schistosoma haematobium

Explanation:

Hematuria points to infection with Schistosoma haematobium because this urinary fluke specifically targets the bladder and ureters. The worms lay eggs in the bladder wall, and the host’s inflammatory response to those eggs causes ulceration and bleeding into the urine, which is often visible as blood in the urine. Over time, ongoing infection can lead to chronic irritation, bladder wall changes, and calcifications. The other organisms listed produce different disease patterns: Trypanosoma cruzi causes Chagas disease with heart and GI involvement; Trichinella spiralis causes muscle inflammation after consuming undercooked meat; Trichomonas vaginalis leads to vaginitis or urethritis with discharge, not hematuria.

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