Ophthalmia neonatorum — structured clinical encounter

A three-day-old term boy is referred from the postnatal ward with a 12-hour history of profuse thick yellow-green discharge from the right eye that reaccumulates within minutes, marked bilateral lid oedema and chemosis, and an intensely red eye. He was born by vaginal delivery after an unbooked pregnancy with no documented antenatal sexually-transmitted-infection screening, and is now visibly jaundiced. You are the paediatric registrar working through recognition, emergency treatment, the drug-choice decision, the swab panel, maternal screening and a later scenario of a ten-day-old with a sticky eye and a staccato cough.