Biden advisers urge state COVID-19 safety after Iowa lifts mask and social distancing rules

U.S. still averages more than 100,000 new cases per day

Chris Kuelling, right, waits to get his COVID-19 vaccination from Billy Martinez, center, with UCHealth, during the mass vaccination event in the parking lots of Coors Field on Jan. 31, 2021, in Denver. (Helen H. Richardson/The Denver Post, pool)