LONDON, England (AP) — The UK recorded more than 50,000 new coronavirus cases for the first time in six months yesterday amid a warning from the British Government’s top medical adviser that the number of people hospitalised with COVID-19 could hit “quite scary” levels within weeks.

Government figures showed another 51,870 confirmed lab cases, the highest daily number since mid-January. Infections have surged in recent weeks, mainly among unvaccinated younger people, as a result of the far more contagious Delta variant and the continued easing of lockdown restrictions.

Despite the increase, the British Government plans Monday to lift all remaining legal restrictions on social contact in England and to ditch social distancing guidelines as well as the legal requirement for people to wear masks in most indoor settings, including shops, trains, buses and subways.

The Government is hoping that the rapid roll-out of vaccines will keep a lid on the number of people becoming seriously ill — a stance that some leading international scientists at an “emergency international summit” critiqued as “reckless”.

The group, which includes advisers to the governments of Italy, New Zealand and Taiwan, said they joined forces through a “sense of urgency” to warn of the global consequences of allowing the delta variant to spread rapidly through the British population.

The scientists warned that the combination of high infection prevalence and high levels of vaccination “create the conditions in which an immune escape variant is most likely to emerge”.

One of the co-signatories to yesterday’s statement, Dr William A Haseltine of the New York-based think tank Access Health International, went further, describing the seeming strategy of herd immunity as “murderous” and “unconscionable”.

Families representing many of those who have died from COVID-19 in the UK also joined in the criticism of the Conservative Government’s plan.

“The overwhelming scientific consensus is that lifting restrictions on Monday will be disastrous, and bereaved families know firsthand how tragic the consequences of unlocking too early can be,” said Jo Goodman, co-founder of Covid-19 Bereaved Families for Justice. “There is a real fear that once again the government’s thinking is being driven by what’s popular rather than the interests of the country.”

Other parts of the UK — Scotland, Wales and Northern Ireland — are taking more cautious steps out of lockdown.

So far, the number of people in hospitals with virus-related illnesses and subsequently dying remains relatively low, certainly when compared with the peak of the second wave of the pandemic earlier this year.

But with the Government putting the country on notice that daily case numbers could rise to over 100,000 sometime this summer, concerns are clearly growing. Prime Minister Boris Johnson has sought to rein in any euphoria around Monday’s lifting of restrictions, an occasion tagged “Freedom Day” on social media.

Johnson is urging people to remain vigilant when meeting with others and to carry on wearing masks in enclosed and crowded places.

His chief medical officer, Chris Whitty, told a webinar hosted by London’s Science Museum late Thursday that the UK is “not out of the woods yet”.

“I don’t think we should underestimate the fact that we could get into trouble again surprisingly fast,” Whitty said.

More cases will inevitably lead to more people requiring hospital attention even though the vaccine roll-out has helped build a wall of immunity around those deemed to be the most vulnerable to disease. More than two-thirds of British adults have received both doses of a vaccine, and almost 88 per cent have had one dose.

Yesterday government data showed 3,964 people hospitalised with COVID-19, the most since late March. Though the number has gone up steadily in recent weeks, it remains far lower than at the height of the second wave in January, when hospitals had around 40,000 COVID-19 patients admitted.

Alongside the increase in hospitalisations, daily virus-related deaths have risen to levels not seen since March. Another 49 virus-related deaths were recorded Friday, taking the UK’s total to 128,642, the seventh-highest in the world.

Government medical adviser Whitty warned that the number of people in hospitals with COVID-19 is doubling about every three weeks and could reach “quite scary numbers” if the current trend continues.

“We are not by any means out of the woods yet on this. We are in much better shape due to the vaccine program, and drugs and a variety of other things,” he said.

“But this has got a long way to run in the UK, and it’s got even further to run globally,” he added.

One potential implication of the big spike in cases — for much of the spring, cases in the UK hovered around the 2,000 mark — is that it may overwhelm England’s efforts to track contacts of those infected with the virus, including the app that is widely used and which has come under criticism in recent days.

“I don’t imagine track and trace will function for much longer,” said James Naismith, director of the Rosalind Franklin Institute at from the University of Oxford “Neither it or the app were designed for 100,000 cases in a highly vaccinated population”.