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What is the cause of a rash after measles–mumps–rubella vaccination?

Surveillance and laboratory confirmation of measles will increase in importance as Australia implements enhanced measles control. We describe a 17‐month‐old child with fever and rash after measles–mumps–rubella vaccination. Detection of vaccine‐strain measles virus in his urine by polymerase chain reaction confirmed the diagnosis of a vaccine reaction rather than wild‐type measles. We propose that measles virus should be sought and identified as vaccine or wild‐type virus when the relationship between vaccination and measles‐like illness is uncertain.