High possibility
Speaking at the virtual 2021 Davos World Economic Forum in January, Albert Bourla, Pfizer's CEO noted there was a "high possibility" that current coronavirus vaccines would not be effective against new strains of the virus in the future.
He was one of four speakers at a panel discussing the need for collaboration between businesses and governments to combat future threats to human health.
"It's a very high likelihood that one day that will happen," Bourla said.