MMRV vaccine and febrile seizures have become more common for children. Fever-induced convulsions are medically referred to as “febrile seizures.” They occur most frequently with fevers of 102 degrees Fahrenheit (38.9 degrees Celsius) or higher, but can also occur at lower levels or while a fever is subsiding.
This seizure sometimes occurs after the MMRV vaccine. Most febrile convulsions last little more than a few minutes. Nevertheless, febrile seizures in children almost always resolve on their own while leaving no lasting effects.