A 28-year-old Marine comes to the veterans' administration outpatient clinic because of a 3-week history of pain on urination. The patient says that the pain has gotten gradually worse and that he has noticed a reddish hue in his urine, especially when he is almost done urinating. He returned from a deployment to Egypt 3 months ago, where he spent 6 months on a mission on the Nile. He has no personal history of serious illness. His father died of metastatic prostate cancer at 82 years of age. He has smoked one pack of cigarettes daily and does not drink alcohol. Vital signs are within normal limits. Physical examination shows no abnormalities. Urine dipstick shows 2+ blood, and urine microscopy shows parasitic eggs with a prominent terminal spine. Which of the following animals is the most likely source of this patient's infection?

Question

Quizplus · Accepted Answer

Eductional Objective: Humans acquire schistosomiasis via contact with freshwater sources that contain snails infected with Schistosoma larvae.  S japonicum and S mansoni cause intestinal and hepatic schistosomiasis, and S haematobium causes urinary schistosomiasis.

A 28-Year-Old Marine Comes to the Veterans' Administration Outpatient Clinic