科研之友
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摘要
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 changewill probably not be sufficient to reverse the growing trend in vaccine refusals.
- 出版日期2014-9
