PBS NewsHour | Clip | How effective will vaccines be in the months to come?

As concerns continue to grow about coronavirus variants in the U.S. and globally, the British authorities on Tuesday said they believe a version of the U.K. variant may stunt the effect of some vaccines. Paul Turner, a professor of ecology and evolutionary biology at the Yale School of Medicine and a specialist on how genes mutate, joins Judy Woodruff to discuss the efficacy of vaccines.