5 experts on why they think the US vaccine booster plan may be premature

The U.S. laid out its COVID-19 vaccine booster plan before releasing data on booster shots' effectiveness or announcing FDA approval for boosters' use in Americans who are not immunocompromised. Many epidemiological experts are critical of this move, as they believe it was premature.

The U.S. said Aug. 18 it is prepared to offer booster shots for all Americans who received two doses of Pfizer or Moderna's COVID-19 vaccine beginning the week of Sept. 20 and starting eight months after an individual's second dose.