Pfizer CEO Albert Bourla said people will “likely” need a booster dose of a Covid-19 vaccine within 12 months of getting fully vaccinated. His comments were made public Thursday but were taped April 1

He also said it’s possible people will need to get vaccinated against the virus annually.

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“It is extremely important to suppress the pool of people that can be susceptible to the virus,” he told CNBC’s Bertha Coombs during an event with CVS Health. He added the vaccines will be an important tool in the fight against highly contagious variants.

Pfizer said earlier this month that updated data from its clinical trial showed its vaccine to be highly effective six months after the second dose. The data was based on more than 12,000 vaccinated participants. More data is still needed to determine whether protections last after six months.

Earlier Thursday, the Biden administration’s Covid response chief science officer David Kessler said Americans should expect to receive booster shots to protect against coronavirus variants. Read more at CNBC