British vaccine is 70.4% effective against Covid-19, data shows

Grant Boone
November 23, 2020

Oxford University has set a target of 53 infections to start the interim analysis of its late-stage trial results, though "lots of cases" in its trial arms in Britain, South Africa and Brazil mean the exact number of infections reported could differ.

Dr Maheshi Ramasamy, investigator at the Oxford Vaccine Group and consultant physician, said: "Older adults are a priority group for Covid-19 vaccination, because they are at increased risk of severe disease, but we know that they tend to have poorer vaccine responses".

But rival drugmakers Pfizer Inc, BioNTech and Moderna Inc have in the past 10 days edged ahead, releasing data from late-stage COVID-19 vaccine trials that shows more than 90% efficacy.

A woman holds a small bottle labelled with a "Coronavirus COVID-19 Vaccine" sticker and a medical syringe in front of displayed Pfizer logo in this illustration taken, October 30, 2020. The combined results showed an average efficacy rate of 70%. Excitingly, we've found that one of our dosing regimens may be around 90 percent effective and if this dosing regime is used, more people could be vaccinated with planned vaccine supply. This vaccine's efficacy and safety confirm that it will be highly effective against COVID-19 and will have an immediate impact on this public health emergency.

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Two other drugmakers, Pfizer and Moderna, last week reported preliminary results from late-stage trials showing that their COVID-19 vaccines were nearly 95% effective.

"Today's announcement is only possible thanks to the many volunteers in our trial, and the hard working and talented team of researchers based around the world".

The Oxford University vaccine trials have been a success.

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