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Booster shot neutralises Omicron, Pfizer and BioNTech say

Third vaccine dose as effective as second shot was in fighting original virus, study finds

BioNTech and Pfizer said a three-shot course of their Covid-19 vaccine was able to neutralise the new Omicron variant. Photograph: Michaela Handrek-Rehle/Bloomberg

Wed Dec 8 2021 - 12:37

BioNTech and Pfizer said on Wednesday that a three-shot course of their Covid-19 vaccine was able to neutralise the new Omicron variant in a laboratory test and that they could deliver an Omicron-based vaccine in March 2022 if needed.

In the first official statement from vaccine manufacturers on the likely efficacy of their shot against Omicron, BioNTech and Pfizer said that two vaccine doses resulted in significantly lower neutralising antibodies but that a third dose of their vaccine increased the neutralising antibodies by a factor of 25.

Blood obtained from people who had their third booster shot a month ago neutralised the Omicron variant about as effectively as blood after two doses fought off the original virus first found in China.

"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," Pfizer chief executive Albert Bourla said in the statement.

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The findings are broadly in line with a preliminary study published by researchers at the Africa Health Research Institute in South Africa on Tuesday, saying that Omicron can partially evade protection from two doses of the Pfizer/BioNTech vaccine, suggesting also that a third shot might help fend off infection.

A lab analysis at the university hospital of Frankfurt, Germany, however found a reduced antibody response to Omicron even after three shots. - Reuters

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