Coronavirus vaccines developed by Pfizer and partner BioNTech are being tested on healthy young adults in the U.S. in a flexible, simultaneous trial of multiple candidates that researchers hope will shorten the development time for a COVID-19 vaccine.

The trial is testing four different versions of a vaccine at the same time, instead of the typical vaccine development process, which can take years of animal experiments before a candidate is tested in humans.

Details later…

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