An FDA advisory panel has voted to recommend emergency use of Pfizer's coronavirus vaccine. Pending FDA approval, the first 2.9 million doses could be shipped out this week. This comes as the U.S. recorded its highest single day death toll Wednesday, with more losses than the country saw on 9/11. Dr. Teresa Amato is the Chair of Emergency Medicine at Long Island Jewish Forest Hills. She joined CBSN with more on how the vaccine works and how to contain the spread.