The MMR vaccine is a live, attenuated vaccine given subcutaneously to provide protection against measles, mumps and rubella. It is recommended as a 2-dose series, with the first dose at 12-15 months and the second dose at 4-6 years. Common side effects include fever and rash. Certain high-risk groups should not receive this vaccine, including those with severe immunodeficiencies or egg allergies. There is no scientific evidence that MMR or other vaccines cause autism.