Ross Clark Ross Clark

Will the first vaccinated Brits have some immunity by Christmas?

Margaret Keenan, the first member of the public to receive the Pfizer vaccine (photo: Getty)

So, Christmas, it seems, will not be cancelled after all. The government has decided instead to tackle fears of a January spike in cases with tougher messaging, telling people that just because they will have the legal right to mix for five days next week doesn’t necessarily mean they ought to avail themselves of that freedom. In other words, we’re not changing the rules, but we’d really rather you didn’t take advantage of them.

But could the vaccinations which have already been performed save us from a post-Christmas spike? The Pfizer vaccine – the only one being given to the general public so far – is designed to be given in two doses, 21 days apart. The first people to be given the vaccine had their first jab last Tuesday, 8 December. Therefore, they won’t be receiving their second jab until 29 December, too late for Christmas.

Nevertheless, does the first jab on its own confer any immunity from Covid-19? Data from the US Food and Drug Administration (FDA) suggests yes – although not until about 14 days after the first jab.

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