A 4th dose of COVID-19 vaccine will be needed, Pfizer’s CEO says
By Jen Christensen and Holly Yan | CNN To help fend off another wave of COVID-19, people will need a fourth dose of vaccine, Pfizer CEO Albert Bourla told CBS on Sunday. “Many variants are coming, and Omicron was the first one that was able to evade — in a skillful way — the immune…
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