Canada Health Alliance

Know Your Child’s Seizure Risk from the MMR Vaccine

Physicians for Informed Consent

Every year, about 5,700 U.S. children suffer seizures from the measles, mumps and rubella (MMR) vaccine. This finding is derived from results of the most statistically powered safety study ever to measure the association between MMR vaccination and febrile seizures. Published in JAMA in 2004, the study evaluated more than half a million children, both vaccinated and unvaccinated, from a Danish population that is relied upon globally to examine vaccine safety.

The results show that seizures from the MMR vaccine occur in about 1 in 640 children up to two weeks following MMR-vaccine administration. Applying this risk of seizures to the 3.64 million U.S. children vaccinated with a first dose of MMR every year results in about 5,700 annual MMR-vaccine seizures.

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