MSFinals-4200

A father brings his 10-month-old daughter to the emergency department due to a rash that has developed. Upon further inquiry, the father explains that the rash started behind her ears two days ago and has since spread. Prior to the rash, the baby had a fever and cough. Although she is up to date with her vaccinations, the father has not yet scheduled her next appointment. During the examination, the baby appears irritable, has white spots in her mouth, and inflamed eyes. What is the most likely diagnosis, and what is the potential risk for the baby?