Analysis by the PA news agency shows that the number of Covid patients on ventilators in England are now at there highest level for more than two months.
Younger people are driving the rise in Covid cases and the average number of patients in hospital is now rising.
Patients on mechanical ventilation beds now stands at 245 on 29 June, which is up from 206 the previous week, which is the highest since 24 April, NHS England figures reveal.
However the number is still very low compared to the peak of the second wave when the average was 3,676 on 26 January.
Professor Stephen Reicher, from the University of St Andrews and a member of the Scientific Advisory Group for Emergencies (Sage) subcommittee on behavioural science, warned that England is in danger of repeating last summer’s mistakes.
He told Time Radio, “My fear is that we’re on line to repeat the mistakes of last summer, if you remember, the Prime Minister told us it was our patriotic duty to go to the pub, that people should go to work or they might lose their jobs, we had eat out to help out.
“The consequence was we never got infections low enough to be able to deal with the disease and so when conditions changed in the autumn, when schools went back and people went back to work and universities went back and the weather got worse and we went inside, so infections spiked.
“And I think this time round, we should learn from that and we should get infections low to a point where we’re in a much better place in the autumn, where we don’t have to reimpose restrictions.”
He added, that “vaccination has made a huge difference but the danger is if we overstate it, and we over-rely on it, actually we undermine all its good effects.
“So it’s belt and braces, of course vaccination makes a difference but it doesn’t mean you forget about everything else.”