According to the Centers for Disease Control and Prevention, 75% of U.S.-based adults have been at least partially vaccinated for COVID-19. But vaccination rates can vary considerably from one state to another. The Mayo Clinic reports that rates for at least partial vaccination range from 77% in Vermont to 49% in Mississippi, 46% in Idaho and 52% in Alabama. Vermont is a deep blue state with a moderate Republican governor, while Mississippi, Idaho and Alabama are deep red states that former President Donald Trump won by a landslide in 2020.