A 34-year-old patient at 38-weeks of pregnancy with genital chlamydia trachomatis.

Explanation

Core Concept: Chlamydia trachomatis is a common sexually transmitted infection that can be vertically transmitted from mother to newborn during passage through an infected birth canal. The most common neonatal manifestations are inclusion conjunctivitis and pneumonia.

Clinical Presentation:

• Classic symptoms: Neonatal conjunctivitis typically presents 5-14 days after birth with eyelid swelling, hyperemia, and mucopurulent discharge. Chlamydial pneumonia presents at 1-3 months of age with a staccato cough, tachypnea, and lack of fever.
• Complications: Corneal scarring, blindness (if conjunctivitis is untreated), and chronic respiratory issues.

Diagnosis:

• First-line diagnostic plan/tool: Nucleic acid amplification testing (NAAT) of conjunctival swabs or nasopharyngeal aspirates.
• Most accurate (gold standard) diagnostic test: NAAT (e.g., PCR) due to its high sensitivity and specificity.

Management:

• Acute management: Oral macrolides (e.g., erythromycin or azithromycin) are the treatment of choice for neonatal chlamydial infections. Topical therapy is ineffective and not recommended.
• Gold standard long-term/definitive management: Complete the full course of oral antibiotics and monitor for resolution of symptoms and potential complications like infantile hypertrophic pyloric stenosis (a known rare side effect of macrolides in neonates).