A 9-day-old infant girl is brought to the clinic with an injected conjunctiva and purulent discharge from both eyes. The infant is afebrile and otherwise appears well. She is breastfeeding and has appropriately been gaining weight since birth. The infant’s mother was sexually active with a new male sex partner late in the pregnancy. The clinician collects an ocular specimen for culture and decides to treat the infant presumptively for ophthalmia neonatorum.