More than 100 million people in the United States have taken one of the coronavirus vaccines authorized by the U.S. Food and Drug Administration, on track to more than meet President Biden’s goal of 200 million inoculations during his first 100 days in office.
But some people have not shown up for the second shot of the messenger-RNA vaccines, which require two doses to achieve the strongest and longest-lasting immunity.
Anthony Fauci, the nation’s leading infectious-diseases expert, recently expressed concern that although a single dose is proven to be up to 80 percent effective, “it is somewhat of a tenuous 80 percent.”
It is not yet known how long
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