WASHINGTON, United States (AFP) — The United States has reached a deal to buy 200 million more doses of Moderna’s Covid-19 vaccine, with the option to purchase variant-specific boosters that are in the pipeline, the biotech company said Wednesday. The purchase brings Washington’s confirmed order to 500 million doses of the two-shot regimen. Moderna has so far supplied 217 million doses, with 110 million more to be delivered by the end of this year and […]