The other 2 arteries that bring blood to the brain, called the vertebral arteries, supply the brainstem. Plaque in the vertebral arteries is much less likely to break off and cause a stroke, but narrowing in the vertebral arteries can cause problems if the brainstem does not get enough blood flow.
A child should receive the first shot when he is between 12-15 months, and the second when he's between 4-6 years of age. If you're not sure if you have had the diseases or the vaccines (prior to 1971 it was given in three separate shots), you can get the MMR vaccine as an adult.
The National Immunisation Program provides free measles, mumps, and rubella (MMR) vaccine to children at 12 months and 18 months of age. The four year old MMR dose ends in December 2015.People who were born during or since 1966, who have not received two doses of a measles containing vaccine, should also be vaccinated. second dose using MMRV vaccine is given at 18 months of age to also protect children from chickenpox. MMR is given at four years of age to children who did not get their second MMR vaccine at 18 months of age.