With the fall semester fast approaching, most Vermont colleges say they expect the vast majority of their students to be vaccinated against Covid-19, which experts say is particularly important in congregate living situations like dorms.Still, colleges that require Covid-19 vaccinations grant exemptions on medical and religious grounds. And rates of exemption vary widely across Vermont campuses — up to a high of 9% of students at Norwich University who have been allowed to forgo vaccinations — raising concerns about controlling spread in a college setting.The goal for colleges should be “as close to 100% [vaccination] as possible,” said Anne Sosin,...