So when WILL Covid chaos end? Booster vaccine immunity weakens after just 10 WEEKS

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So when WILL Britain’s Covid chaos end? Booster vaccine immunity weakens after just 10 WEEKS… but Moderna’s is up to TWICE as effective as Pfizer’s at blocking symptoms

Early real-world analysis of the UK’s immunisation scheme shows the efficacy of Pfizer‘s top-up dose at preventing symptoms drops to as low as 35 per cent two-and-a-half months after getting a third dose, among people already given a full course of AstraZeneca.

But immunity levels appear stable at around 70 per cent after the same period of time for people already dosed up with Pfizer and then given a Moderna booster, even though they plunge to somewhere in the region of 45 per cent for a third dose of Pfizer.

Britain is already considering dishing out a fourth jab because of the data showing immunity fades quickly after a booster. It would bring the UK in line with Israel, which today began tests into whether a second round of boosters would help the most vulnerable. 

Analysis by the UK Health Security Agency (UKHSA) revealed immunity gained from third Covid jabs fades quicker against Omicron than Delta. The graph shows its finding that adults who received two AstraZeneca doses, plus a Pfizer or Moderna booster, are 60 per cent less likely to get symptoms than the unvaccinated if they catch Omicron up to four weeks after their third jab. But after ten weeks, efficacy drops to 35 per cent for Pfizer and 45 per cent for Moderna

But No10’s jab advisers are waiting for more data laying bare how well the vaccines protect against serious illness before pressing ahead with another inoculation drive. Two jabs still drastically cut the risk of hospitalisation even against Omicron, and a third is expected to bolster that further.

It means a fourth dose may not be necessary yet for the entirety of the UK and could see ministers only advised to dish out extra doses to the elderly and immunocompromised in the coming months, even if an annual vaccination drive is eventually signed off for all adults.

UKHSA data shows that those who received Pfizer for all three of their doses saw their protection levels increase to around 70 per cent for two weeks after their top-up dose before falling to around 45 per cent 10 weeks later. People given two AstraZeneca vaccines and a Moderna booster were the most protected, according to the report, with efficacy sitting at 75 per cent against Omicron and lasting for at least nine weeks

One of the Government’s own advisers warned it would be impossible to ‘defeat’ Covid with vaccines if everyone needed a top-up every three months. It would see the NHS have to dish out the equivalent of up to 50million jabs every 90 days, or around 550,000 every day.

This would put the cost of an annual vaccination drive in the region of £4billion, based on one jab being priced at around £20 per dose — similar to Pfizer.

Universal Covid jabs — which experts hope will offer better protection and hold up against variants that emerge in the future — aren’t expected for another 18 months, England chief medical officer Professor Chris Whitty told MPs earlier this month. 

Professor James Naismith, director of national research centre the Rosalind Franklin Institute, said until these jabs are available in around mid-2023, Omicron and Delta could ‘continue to circulate’ and cause waves that potentially pile pressure on the NHS and lead ministers to contemplate bringing in legal restrictions. 

And there is also the chance another variant emerges in the meantime that could cause even more chaos, experts fear.

Professor Naismith told MailOnline: ‘Double vaccination against Delta whilst providing protection against serious illness does not give protection against infection with Omicron. 

‘An Omicron-specific vaccine would be expected to provide more protection against infection with Omicron but perhaps not Delta. 

ENGLAND: The ONS Covid-19 Infection Survey estimates around 1.5million people had Covid on any given day in the week leading up to December 19. The figure was up 65 per cent on the previous week

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