The federal government plans to fund and conduct the decisive studies of three experimental coronavirus vaccines starting this summer, according to a lead government vaccine researcher.

These phase 3 trials are expected to involve tens of thousands of subjects at dozens of sites around the U.S., John Mascola, director of the vaccine research center at the National Institute of Allergy and Infectious Diseases, said in an interview. Meant to determine a vaccine’s safety and effectiveness, they would mark the final stage of testing.

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