The counties where the anti-vaccine movement thrives in the USPeter J. Hotez, The Conversation, November 14, 2018 Together with colleagues from Baylor College of Medicine and Texas Children’s Hospital, where I work, we did an in-depth study of kindergarten schoolchildren who receive vaccine exemptions across the country. Currently, 18 states allow nonmedical vaccine exemptions for either “conscientious objector” or “philosophical/personal belief” reasons.