VIDEO: Even with the race to vaccinate as many Americans as possible accelerating, some experts are warning that if Americans do not also follow proper safety and mitigation measures, the U.S. could see a COVID-19 resurgence.
Although the country's national daily case average continues to fall -- about 32.5% over the last month -- nearly a third of all states have seen their average number of cases rise at least 10%.
Those 15 states are: Alaska, Connecticut, Delaware, Idaho, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Nevada, New Hampshire, New Jersey, Oregon and West Virginia, according to an ABC News analysis of state data compiled by the Centers for Disease Control and Prevention.
Several states -- Delaware, Idaho, Minnesota, Nevada, Oregon and West Virginia -- have seen their case averages increase by at least 25% in the last week.