As part of Operation Warp Speed, the U.S. initiative to rapidly develop and secure vaccines for Covid-19, the U.S. has the option to buy another 300 million doses from Moderna at a fixed price of $16.50 per shot, the company said. The experimental messenger RNA vaccine, which is administered in two doses, is being evaluated by the FDA, and could receive an emergency-use authorization before the end of the month.



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