New COVID-19 cases plummet to lowest levels since last June

A woman dressed in period costume hands a trinket to a child during a parade dubbed "Tardy Gras," to compensate for a canceled Mardi Gras due to the COVID-19 pandemic, Friday in Mobile, Ala. (AP Photo/Gerald Herbert)

New coronavirus cases across the United States have tumbled to rates not seen in more than 11 months, sparking optimism that vaccination campaigns are stemming both severe COVID-19 cases and the spread of the virus.