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Chlamydial Pneumonia — RACP Paediatrics MCQ

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ModerateRespiratoryChlamydial PneumoniaRACP Paediatrics

A 2-month-old infant presents with staccato cough, tachypnoea, and bilateral conjunctivitis. He was born via vaginal delivery. CXR shows bilateral interstitial infiltrates with hyperinflation. Eosinophilia is noted. What is the most likely causative organism?

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Correct answer: E — Chlamydia trachomatis

Chlamydia trachomatis pneumonia in young infants (typically 4-12 weeks) presents with a characteristic staccato cough, tachypnoea without fever, bilateral conjunctivitis, eosinophilia, and hyperinflated lungs on CXR. Transmission occurs during vaginal delivery. Treatment is oral azithromycin.

Reference: Therapeutic Guidelines – 2024 – Antibiotic: Pneumonia in Infants