A 24-year-old man presents with four days of fever, a runny nose, red watery eyes and a dry cough, ten days after returning from Bali. This morning a blotchy red rash appeared on his face and behind his ears and is now spreading down his trunk. His parents declined all childhood vaccinations. His temperature is 39.2 °C, and there are several tiny white-grey dots on the mucosa inside his cheeks. Which one of the following is the most likely diagnosis?
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