Why the race for a COVID-19 vaccine is complicated
Clip: 06/27/2020 | 5m 46s | Video has closed captioning.
Pharmaceutical companies and governments around the world are chasing a coronavirus vaccine, fast tracking the usually years-long vaccine development procedure to a few months. ProPublica reporter Caroline Chen joins Hari Sreenivasan to discuss the ambitious timeline and the unpredictability of the clinical trials.
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