But experts say the good news is that vaccines alleviate cases, as infected people who received an injection reported fewer symptoms.
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They also say the increase in the number of cases is not a cause for concern, as it is expected as the lockdown eases.
The ZOE Covid symptom study app has been tracking the coronavirus outbreak for a year using data from millions of mobile app users.
It says about 2,782 people contract symptoms of Covid every day.
The figure – which does not include asymptomatic cases – is an increase from 1,685 a week ago.
ZOE changed its methodology this week by dividing contributors into those who had been vaccinated and those who had not.
But he said that while it would have driven up the case rate, the 65 percent increase was most likely real and would still have been seen using his old methodology.
Principal Investigator Tim Spector OBE said: “Given the tremendous success of the vaccine deployment, it was essential that we address our methodology.
“We have a disproportionately high number of people vaccinated among our contributors, so we have adjusted our numbers to better reflect the vaccination rate in the UK population.
“As a result, the incidence numbers have been revised to be higher and we have also seen a noticeable 65% increase in numbers compared to last week.
“While the increase in cases this week is likely real, the overall numbers are still only a fraction of what they were at the height of the pandemic.”
In January, it was predicted that 69,958 people would contract symptomatic Covid every day.
Professor Spector continued, “Increases of this size are to be expected with changes in social behavior such as ease of restriction.”
He added “our figures are still as low as last summer, we still have one of the lowest rates in Europe”.
According to data, it is estimated that one in 2020 people currently have Covid.
Data from the study also revealed that the UK R rate is an expected 1.2. Anything above the critical threshold of 1.0 means that the epidemic is increasing rather than decreasing.
What is your risk of catching Covid?
Professor Tim Spector has stated that your risk of catching Covid right now is as follows:
One vaccine: one in 32,000
Fully vaccinated: one in 46,000
However, scientists are well aware that relaxing the restrictions will lead to an increase in cases, especially among young people.
Today’s data further proves that it has already started since pubs welcomed visitors outside, home travel was allowed and places like gyms reopened.
But even with an increase in the rate of R as the lockdown eases further this summer, a ‘third wave’ will not see hospitalizations putting the NHS under pressure, nor too many deaths.
Scientific modeling suggests that in the worst-case scenario, there will be around 11,200 deaths by September 2021, or 4,000 if vaccine immunity remains strong.
While every death is tragic, the estimate is a huge improvement over the 100,000 deaths previously predicted before vaccine success became apparent.
Vaccines reduce infection
The ZOE app further suggests that even if cases are on the rise, it won’t translate into more hospitalizations and deaths.
People vaccinated with a positive Covid test result said they had significantly fewer symptoms during infection than those who were not vaccinated.
They reported either zero symptoms during their first week of infection compared to five in those who did not receive a bite.
And less than half had the “classic” symptoms of a persistent cough, fever and loss of smell compared to nearly 70% of those who were not vaccinated.
Although the vaccines have exceeded expectations for preventing serious illness, some people will still get the coronavirus if it is in circulation, suffering from a mild infection.
Unfortunately, a very small number will still be seriously ill because jabs are not 100% effective.
In a video update, Professor Spector said we have “adjusted to Covid”.
He said, “The good news [is], although it is more difficult to detect, it is that it will be much less likely to be admitted to the hospital because you are less likely to have chest problems, as before the vaccination.
“It doesn’t last that long, so you’re not going to be weakened and be away from work for that long, and we think you’re less likely to develop a long Covid as well. “
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With a huge pool of unvaccinated people – around a third of Britain’s adult population – the virus is still able to circulate.
This comes alongside the easing of the lockdown in all four countries, with the next step in England on May 17.
Some scientists have called for a delay in unlocking due to the new Indian variant rapidly increasing in numbers.