Emory's Del Rio on why Covid-19 vaccine for general public won't be available till Q2 or Q3 of next year

Dr. Carlos Del Rio, a distinguished professor of medicine at Emory University, says people will need at least two doses of Covid-19 vaccine if and when it becomes available to the public. This will inevitably create problems in supply and, as a result, vaccines will not be readily available for the general public until the second or third quarter of 2021. He joins 'Power Lunch' to discuss.