'A huge experiment': How the world made so much progress on a Covid-19 vaccine so fast

The quest to develop a Covid-19 vaccine has been one of the fastest in history, as some candidates are already entering final-stage clinical trials that will demonstrate whether they protect people from the virus. Interviewed for the story UTMB’s James Le Duc said, “This is a huge experiment, and no one knows how it’s going to turn out.” 

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