evidence: A Boy Who Had Cancer Faces Measles Risk From The Unvaccinated [...] "There's little evidence that excluding unvaccinated children from a school where there's no evidence of measles transmission would be an effective public health strategy for limiting the spread of disease," Willis said. In addition, if he were to exclude unvaccinated children from school, that would mean Rhett and others with a medical exemption from vaccines would have to stay home, too.