Ontario is considering making parents who choose to not vaccinate their children for non-medical reasons take a science class. The health ministry of Canada's most populous province has proposed a bill which would force those parents sit through the education session before applying for a vaccine exemption. In the class, they will be taught about the importance of vaccination for their children. Quartz offers more context: Ontario was the first province in Canada to introduce immunization laws (PDF) in 1982, which required children attending school be vaccinated against certain diseases -- including diphtheria, tetanus, polio, and measles -- unless they have a signed exemption. After routine immunization was introduced, cases of those diseases dramatically reduced. Parents who apply for an exemption (PDF) for non-medical reasons risk having their child pulled from school if there's an outbreak, or the immediate risk of an outbreak, of a designated disease.