Covid-19 spreading too fast to lift UK lockdown – Sage adviser

Government advisers have voiced unease over the decision to lift the lockdown while there are still thousands of people becoming infected with the coronavirus every day, warning that loosening restrictions could easily lead to a second wave.

“We cannot relax our guard by very much at all,” said John Edmunds, professor of infectious disease modelling at the London School of Hygiene and Tropical Medicine, and one of the members of the modelling sub-group of Sage (the scientific advisory group on epidemics).

There are still 8,000 new infections every day in England, said Edmunds, without counting those in hospitals and care homes. “If you look at it internationally, it’s a very high level of incidence,” he said. World Health Organization statistics suggest it is the fifth highest in the world.

“The issue is, clearly there’s a need to try and get the economy restarted and people back to their jobs and so on, and also there’s a social and a mental health need to allow people to meet with their friends and families,” he said.

But he added: “I think many of us would prefer to see the incidence driven down to lower levels because that then means that we have fewer cases occurring before we relax the measures.

“I think at the moment, with relatively high incidence and relaxing the measures and also with an untested track and trace system, I think we are taking some risk here.”

The reproductive “R” rate at the moment is between 0.7 and 0.9, said Edmunds, who is part of several groups of mathematical modellers who are combining their data to find the “R” number.

Without any sort of containment, R would be between 3 and 4, he said, meaning that each infected person would transmit the virus to 3 or 4 others.

The aim of the lockdown was to suppress it below 1, at which point the numbers of new cases continue to shrink. But if R is 1 – and allowing more social mobility could easily allow it to rise – then the numbers of people becoming infected each day remain the same.

That could mean 8,000 cases a day, he said, as now. “If there’s a 1% fatality rate, that’s about 80 deaths a day. If there’s a half a percent, that’s 40 deaths per day. So that’s the number of deaths per day that we might expect to see going forward.”

But it was for ministers to decide what to do. That impact on health had to be set against the wider impact of the lockdown on society and the economy. “That’s clearly a political decision. It’s not a scientific decision,” he said.

Mark Woolhouse, professor of infectious disease epidemiology at the University of Edinburgh and also a member of the Sage modelling group, Spi-M, said there was very little chance of eradicating the virus. “That was the World Health Organization’s strategy in the early stages of this pandemic. That’s a strategy they only formally abandoned a few weeks ago. And given that yesterday saw the highest number of cases reported globally ever, global eradication doesn’t look like happening any time soon,” he said.

The relationship with Covid-19 we have had for five months “might turn out to be a lifelong relationship,” he said. It is not possible to maintain social distancing for ever and there is no vaccine yet. “A second wave really is a clear and present danger,” he said.

He was not making predictions, he said, but intensive surveillance, large-scale screening, effective contact tracing, isolation of cases, quarantine for international arrivals and some residual social distancing “is a possible new normal”, he said.