Covid Update: Infectious New Variant & Stretching The Vaccine

The Centers for Disease Control and Prevention predicts that a new, more contagious version of COVID-19 will become the predominant strain by March, testing the new vaccine’s effectiveness. At the same time, researchers are trying to find ways to get the vaccine to more people more quickly by lengthening time between doses, with unknown results. Infectious disease experts discuss where we are in the fight.