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Giardiasis — RACP Paediatrics MCQ

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ModerateGIGiardiasisRACP Paediatrics

A 3-year-old from a family recently arrived from a refugee camp has chronic watery diarrhoea, abdominal bloating, and flatulence. Stool microscopy shows cysts and trophozoites with multiple flagella and a characteristic face-like appearance. What is the most likely diagnosis?

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Correct answer: B — Giardiasis

Giardia lamblia (intestinal) is a common cause of chronic diarrhoea in children, particularly those from areas with poor sanitation. Stool microscopy showing the characteristic pear-shaped trophozoites with two nuclei (face-like appearance) confirms diagnosis. Treatment is with metronidazole or tinidazole.

Reference: Australian Therapeutic Guidelines – 2024 – Antibiotic; RCH Melbourne – 2023 – Chronic Diarrhoea CPG