BioNTech and Pfizer said a three-shot course of their COVID-19 vaccine was able to neutralise the new Omicron variant in a laboratory test and they could deliver an upgraded vaccine in March 2022 if needed.
The German and US companies said two doses of their vaccine resulted in significantly lower neutralising antibodies but a third dose boosted those antibodies by a factor of 25.
“The first line of defence, with two doses of vaccination, might be compromised and three doses of vaccination are required to restore protection,” BioNTech Chief Medical Officer Ozlem Tuereci said at a press conference. The companies suggested that two doses may still protect against severe disease.
BioNTech and Pfizer are the first manufacturers of a COVID vaccine to issue an official update on the efficacy of their shot against Omicron.
In samples of blood taken around a month after the third shot, the Omicron variant was neutralised about as effectively as two doses neutralised the original virus identified in China.
BioNTech CEO Uğur Şahin suggested that countries might consider shortening the time period between second and third doses of the vaccine to combat the new variant.
He cited recent moves by countries including Britain to bring the third shot forward to three months after the second shot, from six months previously.
“We believe this is the right way to go particularly if the Omicron is now spreading further, to enable a better level of protection in the winter season,” Şahin said.
The Omicron variant, first detected in southern Africa and Hong Kong last month, has triggered global alarm about another surge in infections. Cases have already been reported from Japan to the United States and across Europe.
The World Health Organisation classified Omicron on Nov. 26 as a “variant of concern” but said there was no evidence to support the need for new vaccines specifically designed to tackle the variant and its mutations.
Nevertheless, the companies said they would continue efforts to bring an Omicron-specific COVID-19 vaccine to market. Work started when the variant first raised concern on November 25.
They said their planned production of 4 billion doses of the Comirnaty vaccine in 2022 was not expected to change if an adapted vaccine was required.
The findings are broadly in line with a preliminary study published by researchers at the Africa Health Research Institute in South Africa on Tuesday, which said Omicron could partially evade protection from two doses of the Pfizer/BioNTech vaccine and suggested a third shot might help fend off infection.
