Omicron may require fourth vaccine dose, Pfizer says

Omicron may require fourth vaccine dose, Pfizer says

• "But the timeline might need to be moved up for a fourth dose. Previously, Pfizer CEO Albert Bourla, PhD, said another dose might be needed about a year after a third shot. Now the company’s scientists believe that a fourth shot, which targets the Omicron variant, could be required sooner."

• "“What we generally know is the more mutations a variant has, the higher level you need your immunity to be,” Rochelle Walensky, MD, director of the CDC, told the AP."

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