U.S. not banning flights from U.K. despite spread of more infectious coronavirus variant

A newly discovered coronavirus variant spreading rapidly in the UK. is believed to be up to 70% more infectious. More than 40 countries have banned British travelers, but the U.S. has not taken that action. Infectious disease expert Dr. Amesh Adalja tells CBSN AM how genetic surveillance through virus sequencing, rather than travel restrictions, is a more effective tool against the spread.