COVID-19: we need randomised trials of school closures

One of the most controversial and radical societal interventions to curb the COVID-19 epidemic is the closing of schools and nurseries. There seems to be broad agreement that the effect this will have on the spread of the virus is uncertain, and the negative implications are obvious. Economic costs are high when parents must stay at home to take care of their children and cannot work¹ for children, and social isolation and the impact on learning are key concerns, especially if school closures are long-lasting.

Empirical evidence on the effect of school closures stems from observations during influenza epidemics.^{2 3} Systematic reviews have not identified any randomised trials, but observational data indicate that school closures reduce the spread of influenza.^{2 3} However, while children play an important role in transmitting influenza viruses, the available data seem to show that their…

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