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Measles Vaccination and Disease History Assumptions by Age

Use the table to help determine which populations may be more susceptible to measles.
 

​Current Age, Grade
or Year of Birth

​Rationale for Assumptions

Age less than 12 monthsUnvaccinated; if mother is immune, protection from maternal antibody through at least early infancyMMR first given at 12-15 months
Age 12 through 15 monthsMay not yet have 1st dose of MMRMMR first given at 12-15 months
Age 16 months until entering KindergartenIf attending licensed child care, at least 1 dose of MMR likelyChild care requirement
Born after 1986 and has attended school between
K-12 in California
Two doses of measles vaccine likelySince 1999, school requirement for 2nd dose of MMR before 7th grade. Since 1997, school requirement for 2nd dose of MMR before Kindergarten.
Born 1972 -1986 and attended school between
K-12 in California
At least one dose of measles vaccine likelyHigh immunization rates reported for school requirements of 1st dose
​Born 1957 - 1971At least 1 dose of measles vaccine or history of measles disease possible; a small percentage received an ineffective inactivated vaccine between 1963-1968Lower immunization rates reported for students; measles vaccines available in US since 1963
Born before 1957 in the US or before 1970 in another countryLikely history of measles diseaseSerological testing of cohort shows nearly all are immune; infection was common before measles vaccine became available
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