Adenoviral Conjunctivitis (Answer: B)
The diagnosis is adenoviral conjunctivitis, which classically presents with sequential bilateral involvement following an upper respiratory infection, watery discharge, conjunctival injection, and preserved visual acuity.
Clinical Reasoning
The presentation is pathognomonic for viral adenoviral conjunctivitis based on several key features 1:
- Sequential bilateral involvement: Starting unilateral then spreading to the second eye 2 days later is the hallmark pattern of adenoviral infection
- Associated upper respiratory infection: This is a classic predisposing factor for adenoviral conjunctivitis 1
- Watery discharge: Characteristic of viral rather than bacterial etiology
- Preserved visual acuity (20/20 OU): Rules out serious corneal or intraocular pathology
- Occupational exposure: As a healthcare worker (nurse), she has increased exposure risk to infected individuals 1
Why Other Diagnoses Are Excluded
Acute angle closure (A) is immediately ruled out because:
- Visual acuity would be significantly reduced, not 20/20
- Presents with severe pain, headache, nausea, and mid-dilated fixed pupil
- Unilateral presentation that doesn't sequentially involve the fellow eye
Bacterial keratitis (C) is excluded because:
- Would present with purulent (not watery) discharge
- Visual acuity would be reduced due to corneal involvement
- Typically unilateral without sequential bilateral spread
- Would show corneal infiltrate/ulcer on examination
Anterior uveitis (D) doesn't fit because:
- Would cause photophobia and pain
- Visual acuity typically reduced
- Doesn't present with watery discharge or sequential bilateral involvement
- Associated with systemic inflammatory conditions, not URI
Natural History and Management Implications
Adenoviral conjunctivitis is self-limited, with improvement within 5-14 days 1. The condition is highly contagious through hand-to-eye contact, ocular secretions, and respiratory droplets 2.
Key clinical pitfall: The nurse must be removed from patient care duties during the infectious period to prevent nosocomial transmission, as healthcare settings are common sites of adenoviral outbreaks 1, 2.
Treatment is primarily supportive, though recent evidence suggests povidone-iodine may reduce viral load and improve outcomes 3, 4. Monitor for potential complications including subepithelial infiltrates (especially with epidemic keratoconjunctivitis), pseudomembrane formation, and conjunctival scarring 1.