A 4th dose of Covid-19 vaccine will be needed, Pfizer's CEO says, but the company is working on a shot to handle all variants

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 protection that we're giving," Bourla told CBS' "Face the Nation."

"The protection we are getting from the third (dose) it is good enough -- actually quite good for hospitalizations and deaths," Bourla said.

But protection after three doses is "not that good against infections" and "doesn't last very long" when faced with a variant like Omicron.