What are the adverse reactions (“side effects”) to the MMR vaccine?
• Mild soreness or redness at the injection site may occur and last for 1-2 days. • A fever with or without a rash may occur 7-12 days after receiving MMR. • Pain, stiffness or swelling in the joints may occur 1-3 weeks after receiving the vaccine. This is caused by the rubella component of the vaccine. This occurs in about 25 adults out of 100. Women are more affected than men and it may occur in as many as 40 women out of 100. The symptoms usually last for about three days, but could, on rare occasions, last for months. • Should I report any side effects? Please report any unusual side effects that concern you to your doctor or vaccine provider. It is important to monitor the safety of vaccines and to provide medical treatment if it is needed. This information is collected nationally to ensure that health care providers are kept informed about vaccine safety. • Do I need to get bloodwork (serology) done to check my immune status before being vaccinated? No, you do not need to get blo
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