Pfizer Vaccine Appears Effective Against UK Variant Of Covid-19

Sara C Nelson
·Senior Editor, HuffPost UK
·1-min read

The Covid-19 vaccine developed by Pfizer and BioNTech is likely to protect against the more infectious strain of the virus that has helped drive soaring cases in the UK.

The encouraging results, which have come out of BioNTech’s own headquarters and have yet to be peer reviewed, stem from analysing the blood of participants in trials. They are based on more extensive analysis than those already released by the US drugmaker Pfizer.

Last week, the company said a similar laboratory study showed the vaccine was effective against one key mutation, called N501Y, found in both of the highly transmissible new variants spreading in Britain and South Africa.

The latest study, posted on, was conducted on a synthetic virus with 10 mutations that are characteristic of the variant known as B117 identified in Britain.

It provides further hope as record numbers of daily deaths from Covid-19 are reported in Britain, which is believed to be driven by the more transmissible variant. It also means vaccine development would for now not have to start all over again.

For the test, blood samples drawn from 16 vaccinated participants in prior clinical trials were exposed to a synthetic virus called pseudovirus which was engineered to have the same surface proteins as B117, as characterised by 10 hallmark mutations.

The antibodies in the blood of the volunteers given the vaccine, known as Comirnaty, or BNT162b2, neutralised the pseudovirus as effectively as the older coronavirus version that the product was initially designed for.

This is a breaking news story and will be updated. Follow HuffPost UK on Twitter, Facebook and Instagram.


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This article originally appeared on HuffPost UK and has been updated.