NBME Answers ↦
The clinical presentation sounds like a GI parasite, which are transmitted via fecal-oral route, so ingestion of soil would be the most sensible answer. All the other routes are of parasites with more severe or systemic infection.
@mdmofongo I know this. But which parasite is this?
The parasite is most likely Trichuris trichiura (human whipworm). Trichuriasis is often asymptomatic and adult forms can reach 2 cm in length (visible with naked eye). A lot more common in tropical areas but there have been cases in the southeastern US (ex: Kentucky). All other GI worms would present with either a fever or a cough. Treat with mebendazole or albendazole.