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once a one year old receives the measles vaccine ... how...
once a one year old receives the measles vaccine ... how long before they are considered protected from the measles virus?
In general, protection starts to develop after about two weeks of getting the measles, mumps, rubella (MMR) vaccine; however, a number of factors impact an individuals’ response to vaccines.
Two doses of the MMR vaccine are needed for best protection. The efficacy of a single dose of measles-containing vaccine given at 12 months of age is estimated to be 85% to 95%. With a second dose, efficacy in children approaches 100%.