Many patients still fell sick from the Delta variant despite receiving the jab, data shows (Image: POOL/AFP via Getty Images)
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A third of A&E Covid patients infected with the Delta variant had received at least one jab, data shows.
Of the 1,234 people who attended emergency units in England with the strain, 825 were unvaccinated, the equivalent of 67% of the patients.
The Public Health England data, which covers the period from February 1 to June 7, showed that the other patients had recently received at least one vaccine jab.
The figures could now raise questions about the effectiveness of jabs against the variant, as patients still became sick enough to require hospital treatment even after having one or two doses.
Some 220 patients attended hospital more than 21 days after their first dose of a vaccine, while 83 were over 14 days after their second jab.
Public Health England also revealed that 19 people who had at least one dose of a Covid vaccine had died with the Delta variant as of June 7 – although this is a very low number when compared to deaths overall.
There is still uncertainty about how effective vaccines are against the Delta variant
(Image: Adam Gerrard / Sunday Mirror)
In total, 42 people died with the variant in England as of June 7, 23 of whom were unvaccinated.
Seven were more than 21 days after their first dose of a vaccine and 12 were over 14 days after their second jab.
Cases of the Delta variant in the UK have more than doubled in a week, according to new data, fuelling fears the lockdown may be extended beyond June 21.
Public Health England believe the new strain is 60% more transmissible than the Alpha variant, which was first detected in Kent.
This is far higher than Deputy Chief Medical Officer Jonathan Van-Tam's previous estimate of 25%.
It comes after a study suggested the Pfizer vaccine provided less protection against the Delta strain, which was first detected in India, than other variants.
There is still uncertainty over how effective the jabs are in preventing people infected with the Delta variant from falling seriously ill and even dying.
Earlier this week, Professor Neil Ferguson, of Imperial College London, said that "in the next few weeks" experts hope to be able to see more clearly what the ratio is between hospital admissions and cases.
However he added that it was already known that "vaccination has fundamentally changed that ratio" for the better.
Chris Hopson, the chief executive of NHS Providers, also previously said the number of people in hospital with the Delta variant was not increasing "very significantly".
The impact of vaccines on the Delta variant should become clearer in the coming weeks, an expert said
(Image: Getty Images)
He insisted the vaccines appear to have "broken the chain" between catching coronavirus and becoming seriously ill.
He told BBC Breakfast that many of those in hospital in Bolton – which has the highest number of cases of the Delta variant in England – were younger than in previous waves of the pandemic.
It is understood there are GPs in Bolton who have begun offering vaccines at a 28-day gap, in the face of pressure not to waste any doses.
Speaking about hospitals, Mr Hopson said on Saturday: "The people who came in this time round were actually a lot younger and were a lot less at risk of very serious complication, less at risk of death, and what that means is that they were less demand on critical care.
"What we think we can start to say now, based on that experience, is that it does look as though the vaccines have broken the chain between catching Covid-19 and potentially being very, very seriously ill and potentially dying.
"There were very, very few people who have had those double jabs and had been able to have that build-up of protection after those jabs."