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Oxford-AstraZeneca vaccine 70% effective on average at preventing COVID-19

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Tweaking the vaccine dose can improve its efficacy. Plus, what's the cost of not getting a vaccine to everyone in the world? And, China proposes a QR code system to open up international travel.
The team
David Brancaccio
Host
Victoria Craig
Host, BBC
Stephen Ryan
Senior Producer, BBC
Jonathan Frewin
Producer, BBC
Daniel Shin
Producer
Jay Siebold
Technical Director
Brian Allison
Engineer
Meredith Garretson
Senior Producer
Erika Soderstrom
Producer
Rose Conlon
Producer
Alex Schroeder
Producer