immunization branch

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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