What caused the variants seen in the SARS-CoV-2 virus in the UK and elsewhere? Why is the UK variant more contagious? Is it more lethal? Will the current vaccines still work against these variants? Is there anything we should be doing differently to protect ourselves?

Expert virologist Dr. Andy Pekosz talks with Dr. Josh Sharfstein about how the virus that causes COVID-19 is changing, and what it means for 2021.