Two vaccine doses may not provide sufficient protection against Omicron coronavirus variant, but protection improves with three doses, Pfizer says - CNN
Dec 08, 2021 1 min, 1 sec
Samples from people who had two doses of the Covid-19 vaccine saw, on average, a more than 25-fold reduction in neutralization ability against the Omicron variant than the earlier virus, "indicating that two doses of BNT162b2 may not be sufficient to protect against infection with the Omicron variant," the companies said.

The companies said two doses may still provide protection against severe disease.

"Although two doses of the vaccine may still offer protection against severe disease caused by the Omicron strain, it's clear from these preliminary data that protection is improved with a third dose of our vaccine," Pfizer Chairman and CEO Albert Bourla said in a statement.

"Ensuring as many people as possible are fully vaccinated with the first two dose series and a booster remains the best course of action to prevent the spread of COVID-19."

The initial lab studies used serum from blood from individuals who received two or three doses of the Pfizer/BioNTech Covid-19 vaccine.

Those who got the Johnson & Johnson one-shot vaccine are eligible for a booster of any authorized vaccine two months after their first dose.

About a quarter of adults who are vaccinated against Covid-19 have also received a booster dose, according to CDC data.

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