Do Stricter Immunization Laws Improve Coverage? Evidence from the Repeal of Non-medical Exemptions for School Mandated Vaccines

Nonmedical exemptions are widely shown to be associated with outbreaks of vaccine-preventable disease. In response to a recent measles outbreak in 2015, California acted to increase immunization coverage by removing all nonmedical exemptions effective in 2016. Employing a unique dataset of county大量研究普遍表明，非医疗豁免（nonmedical exemptions）与疫苗可预防疾病（vaccine-preventable disease）的暴发存在密切关联。针对2015年暴发的麻疹疫情，加利福尼亚州采取相关措施提升疫苗接种覆盖率，于2016年起全面取消所有非医疗豁免政策。本研究采用一套独特的县级数据集