A previously healthy, 13 year old female presented to our hospital with a 3‐day history of a diffuse maculopapular rash, fever, cough, and coryza. The patient developed her symptoms 9 days after receiving measles and rubella (MR) vaccine in the local DAV school. She had no previous adverse reactions to immunizations. Her past medical history was significant for allergic rhinitis for which he had been prescribed cetirizine, but the patient did not receive any medication for 10 days prior to his admission The patient had no known sick contacts or any known contacts with a rash.

The patient had no history of travel outside, no animal contact, no ingestion of unpasteurized dairy products, and no consumption of undercooked meats. On examination, the patient had a full‐body blanchable maculopapular rash. All routine laboratory values were normal. A blood culture showed no growth after 5…