Enterobius vermicularis (Pinworm)

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Enterobius vermicularis (Pinworm)

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USMLE® Step 1 style questions USMLE

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A 7-year-old boy is brought to the pediatrician by his parents for evaluation of abdominal pain, which has been ongoing for the past 2 weeks. The pain is dull and intermittent. In addition, the parents have noticed that the patient frequently scratches his perianal region while asleep. Temperature is 37.5°C (99.5°F), blood pressure is 102/73 mmHg, and pulse is 87/min. Examination of the heart, lungs, and abdomen are unremarkable. Erythema is noted in the perianal region. A tape test is performed and reveals multiple ovoid eggs under microscopy. Which of the following pathogens is most likely responsible for this patient’s symptoms?  

External References

First Aid

2024

2023

2022

2021

Enterobius spp.

diseases association p. 158

infection routes p. 155

Enterobius vermicularis p. , 156

Pinworms p. 156

Summary

Enterobius vermicularis is a small parasitic worm that lives in the human large intestine. People get infected with pinworms via the feco-oral route, and its classical symptoms is pruritus around the anus, but can also cause insomnia, irritability, and weight loss. Diagnosis requires the visualization of the eggs on a scotch tape test.