During a well-baby assessment on a 1-week-old infant who had a normal exam when discharged from the newborn nursery 2 days earlier, the primary care nurse practitioner notes eyelid swelling, bulbar conjunctival injection, and thick purulent discharge. What is the most likely diagnosis?

Choice A reason: HSV conjunctivitis in neonates is rare and typically presents with vesicular lesions on the skin or cornea, often accompanied by systemic signs such as lethargy or seizures. It is not the most likely cause of thick purulent discharge in the first week of life. Choice B reason: Neisseria gonorrhoeae conjunctivitis typically presents within 2–5 days of birth and is characterized by profuse purulent discharge, eyelid swelling, and bulbar conjunctival injection. It is a medical emergency due to the risk of corneal ulceration and blindness if untreated. Choice C reason: Chemical conjunctivitis usually occurs within 6–24 hours after birth due to prophylactic eye drops and resolves spontaneously within 48–96 hours. It does not cause thick purulent discharge or significant eyelid swelling. Choice D reason: Chlamydia conjunctivitis typically presents between 5–14 days after birth and may cause mild to moderate mucopurulent discharge. The timing and severity of symptoms in this case point more strongly to gonococcal infection.