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Fauci says he wouldn’t be surprised if Covid vaccines require three shots for full regimen, instead of two

  • White House chief medical advisor Dr. Anthony Fauci said he would not be surprised if the recommended full regimen for the Pfizer and Moderna Covid vaccines becomes three doses.
  • Giving people an additional dose, or perhaps a final dose, several months after they've received their initial vaccination helps the immune system mature, he said.

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Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, speaks during a Senate Health, Education, Labor, and Pensions Committee hearing at the Dirksen Senate Office Building in Washington, D.C., U.S., July 20, 2021.Stefani Reynolds | Reutesr

White House chief medical advisor Dr. Anthony Fauci said Thursday he would not be surprised if the recommended full regimen for the Pfizer and Moderna Covid-19 vaccines in the U.S. becomes three doses, instead of two.

Giving people an additional dose, or perhaps a final dose, several months after they've received their initial vaccination helps the immune system mature, said Fauci, also the director of the National Institute of Allergy and Infectious Diseases.

"I must say from my own experience as an immunologist, I would not at all be surprised that the adequate full regimen for vaccination will likely be three doses," Fauci told reporters during a White House Covid briefing.

The infectious disease expert's comments come as the Biden administration prepares to begin widely distributing Covid booster shots the week of Sept. 20.

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