Jon Cohen, Kai KupferschmidtScience’s COVID-19 reporting is supported by the Heising-Simons Foundation.Last week, U.S.
President Joe Biden shaved 2 months off earlier projections and promised COVID-19 vaccine doses would be available for all U.S.
adults by the end of May. That’s welcome news for the United States, which has had more COVID-19 cases and deaths than any other country.
It could also be good news for nations that may benefit from the more than 1 billion extra doses the federal government has ordered.Like three dozen other countries, the United States contracted with multiple vaccine companies for several times the number of doses needed to cover its population.