Pfizer's Covid vaccine is more than 90% effective, but there is low supply

Stocks rallied today on news of Pfizer's Covid vaccine, which has proven to be more than 90% effective in trials. There will be 50 million doses of it available this year and about 1.3 billion in 2021. CNBC's Meg Tirrell joins Shep Smith to talk about the timeline of Pfizer's Covid vaccine.
Mon, Nov 9 20207:11 PM EST