LONDON : Britain faces a second wave of COVID-19 this winter twice as widespread as the initial outbreak if it reopens schools without a more effective test-and-trace system in place, according to a study published on Tuesday.Researchers from University College London and the London School of Hygiene and Tropical Medicine modelled the impact of reopening schools either on a full- or part-time basis, thus allowing parents to return to work, on the potential spread of the virus.They concluded a second wave could be prevented if 75% of those with symptoms were found and tested and 68% of their contacts were traced, or if 87% of people with symptoms were found and 40% of their contacts tested."However, we also predict that in the absence of.