FDA to authorize third vaccine dose for Americans with weakened immune systems. New report estimates 1 million people took third unauthorized dose as booster.

The Food and Drug Administration is set to authorize a third vaccine dose for any Americans with weak or compromised immune systems, the New York Times reported Wednesday.

The news came shortly after the Centers for Disease Control and Prevention announced that it estimates more than 1 million people who received the Moderna or Pfizer COVID-19 vaccines went back for what they're calling an "unauthorized" third dose as a booster shot.

What are the details?

The move could come as soon as Thursday, according to the outlet's Sharon LaFraniere and Noah Weiland,...