A study published on Tuesday has said that Britain is at the risk of facing a second wave of COVID-19, two times the size of the initial outbreak during the coming winter if schools reopen without an adequate and effective test-and-trace system in place.

Researchers from the London School of Hygiene and Tropical Medicine and University College London modeled the consequences of reopening schools either on a part-time or full-time basis, thereby permitting parents to get back to work, upon the potential spread of the infection.

Taking Reopening of Schools Seriously

They concluded a second wave could be prevented if 75 percent of those with symptoms were found and tested and 68 percent of their contacts were traced, or if 87 percent of people with symptoms were found and 40 percent of their contacts tested.

People Wearing Masks
People Wearing Masks (Representational Picture) PxHere

"However, we also predict that in the absence of sufficiently broad test–trace–isolate coverage, reopening of schools combined with accompanied reopening of society across all scenarios might induce a second COVID-19 wave," said the authors of the study, published in The Lancet Child and Adolescent Health.

"Our modeling results suggest that full school reopening in September 2020 without an effective test-trace-isolate strategy would result in R rising above 1 and a resulting second wave of infections that would peak in December 2020 and be 2.0-2·3 times the size of the original COVID-19 wave," they said.

Returning to School A National Priority: Johnson

The lead author of the study, Jasmina Panovska-Griffiths, said the test-and-trace system in England was currently reaching only about 50 percent of the contacts of all those testing positive for COVID-19.

Panovska-Griffiths, lecturer in mathematical modeling at University College London, told BBC radio that the worst scenarios could still be avoided. "Importantly, what we find is that it is possible to avoid a second epidemic wave if enough people with symptomatic infections can be diagnosed. Their contacts can then be traced and effectively isolated," she said.

"We are the first study that has quantified this, how much this needs to be for the UK." Schools in Britain closed in March during the national lockdown, except for the children of key workers, and reopened for a small number of pupils in June.

However, the government says all pupils will return to school across the United Kingdom by early September with Prime Minister Boris Johnson saying it is a national priority. "I think we all accept that test-and-trace is a programme which needs to continue to improve. There is total humility in government about that," junior local government minister Simon Clarke told BBC radio. "We fully accept that we need to keep driving those numbers up," he said.

(With inputs from agencies)