A patient passes a 25 cm long, pinkish-white worm in their stool. Microscopy of the worm shows a tripartite lip with dentigerous ridges. The likely parasite is: A) Enterobius vermicularis (female) B) Ascaris lumbricoides (adult female) C) Strongyloides stercoralis (adult) D) Necator americanus (adult)
A 4-year-old child presents with perianal pruritus (itching) at night, especially after the child falls asleep. The most probable diagnosis is: A) Hookworm infection B) Enterobiasis C) Ascariasis D) Trichuriasis
: Offers a wide variety of questions focusing on morphology and classification. mcq on intestinal nematodes pdf
D) Ancylostoma duodenale Rationale: Hookworms attach to the small intestinal mucosa and feed on blood. A heavy infection can lead to a daily blood loss of 0.2–0.3 mL per worm, causing microcytic hypochromic anemia.
✅ Correct: Trichuris trichiura is nicknamed the whipworm because of its thin anterior and thick posterior end. A patient passes a 25 cm long, pinkish-white
B) Auto-infection and persistent infection for decades Rationale: S. stercoralis can complete its entire life cycle inside the human host via autoinfection, leading to chronic infection lasting 40+ years, even without re-exposure.
(Threadworm): Unique for its ability to cause "Cochin-China diarrhea" and autoinfection. Practice Multiple Choice Questions (MCQs) The most probable diagnosis is: A) Hookworm infection
Always verify that the PDF is from an academic (.edu) or governmental (.gov) source to ensure accuracy.