The MMR vaccine has some side effects. For example, about 1 in 6 children develop a fever 7 to 12 days after immunization, and about 1 in 3,000 develop febrile seizures. Some parents think that MMR is unsafe because it has some adverse effects, but this is not the case. These side effects, most of which are benign, are acknowledged by members of the medical profession. The benefits of MMR far outweigh the risks of these recognized side effects. The vaccine has an excellent safety record. Hundreds of millions of children have safely received the vaccine worldwide.
It is important that children receive MMR. Without a high uptake of the measles component of the vaccination, the possibility of outbreaks of measles increases. Because 1 in 1,000 cases of measles is associated with encephalitis, the risk of this potentially deadly infection in children is also increased.