Maternal, Infant, and Children’s Health

Kindergarten MMR Immunization Rates

Santa Clara & San Mateo Counties, San Francisco, and California

Data Source:

California Department of Public Health


Silicon Valley Institute for Regional Studies

Data for kindergarten immunization rates come from the kindergarten assessment, which measures compliance with the school immunization law, conducted in all schools with kindergartens. Immunizations required by law for children entering kindergarten in California or transitional kindergarten include: Five doses of DTP/DTaP or any combination with DT (diphtheria and tetanus) vaccine (four doses meets the requirement if at least one was given on or after the fourth birthday); Four doses of polio vaccine (three doses meets the requirement if at least one was given on or after the fourth birthday); Two doses of MMR vaccine (may be given separately or combined, but both doses must be given on or after the first birthday); Three doses of hepatitis B vaccine; and one dose of varicella (chickenpox) vaccine (or physician documented varicella disease history or immunity). In the fall, every school in California must provide information on the total enrollment, the number of students who have or have not received the immunizations required, and the number of exemptions to the California Department of Health. Smaller schools are excluded to help protect privacy. In the spring, local and state public health personnel visit a sample of licensed schools with kindergarten classes, to collect the same information for comparison. In the 2014-2015 and 2015-2016 school years, entrants were subject to Assembly Bill (AB) 2109, which added requirements for exemptions to required immunizations based on personal beliefs. Effective July 1, 2016, California Senate Bill (SB) 277 eliminated the exemption for required immunizations based on personal or religious beliefs. The year shown represents the end of the school year (e.g., 2016 represents the 2015-16 school year).

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