Question:
A 5-year-old child presents with intense perianal itching, predominantly during nighttime. Microscopic examination reveals an egg. Which organism is most likely responsible for the condition?
A 5-year-old child presents with intense perianal itching, predominantly during nighttime. Microscopic examination reveals an egg. Which organism is most likely responsible for the condition?
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Child with nighttime perianal itching = Enterobius vermicularis.
Updated On: May 14, 2026
- Enterobius vermicularis
- Ancylostoma duodenale
- Hymenolepis nana
- Trichuris trichiura
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The Correct Option is A
Solution and Explanation
Concept:
Enterobius vermicularis, also called pinworm, commonly causes nocturnal perianal itching in children. Eggs are usually detected by the perianal tape test.
Step 1: Identify clinical clue.
The key symptom is: \[ \text{Nocturnal perianal itching} \]
Step 2: Recall causative organism.
This is classic for: \[ \textit{Enterobius vermicularis} \]
Step 3: Interpret egg finding.
The egg of Enterobius is typically oval and flattened on one side. Therefore, the organism is: \[ \textit{Enterobius vermicularis} \]
Step 1: Identify clinical clue.
The key symptom is: \[ \text{Nocturnal perianal itching} \]
Step 2: Recall causative organism.
This is classic for: \[ \textit{Enterobius vermicularis} \]
Step 3: Interpret egg finding.
The egg of Enterobius is typically oval and flattened on one side. Therefore, the organism is: \[ \textit{Enterobius vermicularis} \]
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