Most people who receive the MMR vaccination have no reaction to it. Statistics to keep in mind regarding MMR side effects include the following:
About 5 to 15 percent of those receiving the MMR vaccination develop a fever after 5 to 12 days. Similarly, 5 percent may develop a rash after 5 to 12 days.
Central nervous system conditions, including encephalitis and encephalopathy, have been reported with a frequency of less-than 1 per 1,000,000 doses of vaccine administered.
As with the administration of any agent that can cause fever, the MMR vaccine may cause simple febrile seizures in some children. These convulsions affect children with no known risk factors for seizure. Children with a prior history of convulsions may be at increased risk for febrile seizures following MMR vaccination.
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