A 15-mo girl with no PMHx developed cough, fever, and conjunctivitis 1 day after her first MMR vaccine. Four days later, she vomited, and a rash developed behind her ears, spreading to her face and trunk. Exam showed tiny white papules on her oral mucosa. What is it?
Drug eruption
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Idiopathic thrombocytopenic purpura
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Measles
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Parvovirus B19
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Varicella
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