THE UK could still see 100,000 daily Covid cases this autumn, Professor Lockdown warned this morning.
Neil Ferguson said it was "possible" infections could still rocket despite vaccinations, although deaths would be kept low.
He also warned around 1,000 people a day might be admitted to hospital, if cases soared.
He told the Today programme on Radio 4: "Numbers have basically plateaued at this time and are really quite high, about 30,000 cases-a-day.
"That's a slightly sobering situation coming into September because our contact rates are at half the levels and we will be opening schools going back into offices.
"So we have the potential for quite a large wave going into September/October."
The professor added: "What we can be confident in is vaccinations protecting people against the most severe disease so it's very unlikely we'll see that levels of death that we saw this January."
It comes as Brits who are double-jabbed no longer have to self isolate if they come into contact with a positive Covid case.
The new rules come into force today and apply to people in England who have had both doses of a coronavirus vaccine, or are under 18.
They will be advised to take a PCR test, but it's not compulsory and they won't have to self-isolate while they wait for the result.
People who test positive will still be legally required to self-isolate.
If someone develops symptoms, the Government says they should self-isolate and get a PCR test, and stay in isolation until the result comes back.
The new guidance will apply to people who had their final dose of an approved vaccine at least 14 days before coming into contact with a positive case.
Professor Stephen Reicher, said he was relatively optimistic about the levels of coronavirus cases in England as new rules surrounding isolation come into force on Monday.
But he added that messaging from the Government needed to continue around encouraging people to get PCR tests if they do come into contact with someone who has the virus and the protection levels of vaccines.
"You're not invulnerable if you're double-vaccinated, there's still a fairly good chance you could get infected and infect others," he warned.
There are now 21 symptoms of Covid that mean you should get a test as soon as possible.
The NHS still only has the classic three listed, but experts believe many more are signs you have the bug – so it's important to act fast.
While you are much more protected from the virus if you have been vaccinated, you can still catch it and pass it on – so it's good to know the new signs.
And as Delta continues to spread around the country, it has also produced some different symptoms to the traditional ones.
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