The U.S. is moving onto its next phase of coronavirus vaccinations, with major expansions to immunization sites at stadiums and convention centers. The efforts come as the country's seven-day average of COVID-19 deaths now stands at over 3,000 a day. Dr. Dyan Hes, founder of Gramercy Pediatrics, joined CBSN to discuss the latest on vaccinations and what we are learning from new studies on immunity and traveling during a pandemic.
