A 28-year-old woman presents with acute onset bilateral conjunctival injection, chemosis, and copious purulent discharge for 2 days. She reports severe eye pain and photophobia. On examination, preauricular lymph nodes are not palpable. Gram stain of the discharge shows gram-negative diplococci. What is the most appropriate immediate next step in management?

Explanation

## Clinical Diagnosis **Key Point:** Gram-negative diplococci in acute purulent conjunctivitis with severe pain and photophobia is pathognomonic for *Neisseria gonorrhoeae* (gonococcal conjunctivitis). ## Why Systemic Therapy Is Mandatory **High-Yield:** Gonococcal conjunctivitis is a medical emergency because: 1. Risk of rapid corneal perforation and blindness (within 24–48 hours if untreated) 2. Topical antibiotics alone **cannot achieve adequate aqueous humor concentrations** to prevent keratitis 3. Systemic therapy is required to eradicate the organism and prevent corneal scarring ## Management Algorithm ```mermaid flowchart TD A[Acute purulent conjunctivitis]:::outcome --> B{Gram stain result?}:::decision B -->|Gram-negative diplococci| C[Gonococcal conjunctivitis]:::urgent C --> D[Systemic ceftriaxone 1 g IV/IM BD]:::action D --> E[Add topical erythromycin ointment]:::action E --> F[Urgent ophthalmology referral]:::action F --> G[Daily monitoring for corneal involvement]:::action B -->|Gram-positive cocci| H[Staphylococcal conjunctivitis]:::outcome H --> I[Topical fluoroquinolone sufficient]:::action ``` ## Rationale for Correct Answer **Clinical Pearl:** Ceftriaxone 1 g IV or IM twice daily is the DOC for gonococcal conjunctivitis because: - Achieves bactericidal concentrations in aqueous humor and conjunctiva - Covers penicillinase-producing *N. gonorrhoeae* (PPNG) - Topical erythromycin ointment provides additional local coverage and prevents secondary infection **Warning:** Topical therapy alone (options A, C, D) will fail because the organism rapidly invades the corneal stroma, causing keratitis, ulceration, and permanent scarring. ## Associated Management - Prophylactic topical erythromycin or tetracycline ointment for neonatal eyes (ophthalmia neonatorum prevention) - Contact tracing and treatment of sexual partners - STI screening (syphilis, chlamydia, HIV) - Urgent ophthalmology referral for daily slit-lamp examination [cite:Khurana Textbook of Ophthalmology Ch 5]