The risks and rewards of Operation Warp Speed's approach to vaccines

The race to develop vaccine candidates to prevent COVID-19 represents an unprecedented national and global effort. President Trump and some public health experts say encouraging early results from Pfizer and Moderna suggest the approach is working. But there are also questions about the risks of ramping up vaccine research and development at this scale and on this timeline. Miles O'Brien reports. PBS NewsHour is supported by - https://ift.tt/3cb1NLD

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