Potential effects of California's new vaccine exemption law on the prevalence and clustering of exemptions

Am J Public Health. 2014 Sep;104(9):e3-6. doi: 10.2105/AJPH.2014.302065. Epub 2014 Jul 17.


Exemptions from childhood immunizations required for school entry have continued to increase among California kindergartners, and exemptions show spatial clustering within the state. A 2014 change in California's school-entry vaccine exemption law requires parents filing for an exemption to submit signed documents from a health care provider. However, the evidence presented here suggests that the policy change will probably not be sufficient to reverse the growing trend in vaccine refusals.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • California
  • Cluster Analysis
  • Health Policy*
  • Humans
  • Immunization / legislation & jurisprudence*
  • Prevalence
  • Schools / legislation & jurisprudence*
  • Vaccines / administration & dosage*


  • Vaccines