Biden Promises 100 Million Vaccine Shots in 100 Days, but Shortage Worries Rise

WASHINGTON — President-elect Joseph R. Biden Jr., setting ambitious goals to change the course of the coronavirus pandemic, vowed on Tuesday to get “at least 100 million Covid vaccine shots into the arms of the American people” during his first 100 days in office, and said he would make it a “national priority” to get children back to school during that time.