Countries like the UK that have closed schools to help stop the spread of coronavirus should ask hard questions about whether this is now the right policy, says one team of scientists. The University College London team says keeping pupils off has little impact, even with other lockdown measures. The research, published in The Lancet Child and Adolescent Health, looked at 16 studies - some based on the spread of coronavirus, and others on seasonal flu and the 2003 Sars outbreak. While school closures help during influenza outbreaks, the same may not apply to coronavirus. Data from the Sars outbreak ... suggest that school closures did not contribute to the control of the epidemic. Recent modelling studies of Covid-19 predict that school closures alone would prevent only 2%-4% of deaths, many fewer than other social distancing interventions. One of the research authors, Prof Russell Viner, said: "Data on the benefit of school closures in the coronavirus outbreak is limited, but what we know shows that their impact is likely to be only small. Additionally, the costs of national school closures are high - children's education is damaged and their mental health may suffer, family finances are affected. Policymakers need to be aware of the equivocal evidence." He says policymakers must weigh up the possible harms and reopen schools at the earliest opportunity - and not necessarily wait until September if it can be done safely sooner.