Biden’s 1.1 billion measure potential: Big, but not big enough, experts say

One of those goals, according to the White House, is to have 70 percent of the world’s population fully vaccinated by this time next year. And to reach it, the United States would step up its own commitment, Biden announced, purchasing a further 500 million doses of the Pfizer-BioNTech vaccine to donate — bringing its total number of pledged doses to donate to over 1.1 billion.

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