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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 months​Unvaccinated; if mother is immune, protection from maternal antibody through at least early infancy​MMR first given at 12-15 months
​Age 12 through 15 months​May not yet have 1st dose of MMR​MMR first given at 12-15 months
​Age 16 months until entering Kindergarten​If attending licensed child care, at least 1 dose of MMR likely​Child care requirement
​Born after 1986 and has attended school between
K-12 in California
​Two doses of measles vaccine likely​Since 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 likely​High immunization rates reported for school requirements of 1st dose
​Born 1957 - 1971​At least 1 dose of measles vaccine or history of measles disease possible; a small percentage received an ineffective inactivated vaccine between 1963-1968​Lower immunization rates reported for students; measles vaccines available in US since 1963
​Born before 1957 in the US or before 1970 in another country​Likely history of measles disease​Serological testing of cohort shows nearly all are immune; infection was common before measles vaccine became available
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