A critical ingredient of the exit from the costly confinement policy is mass testing for the presence of the virus, given the large fraction of asymptomatic infected people. It will take time to build a testing capacity compatible with the objective of removing most people from the lockdown without risking a second wave of infection. I explore a short-term strategy consisting in pooling tests. I characterize the optimal group testing solution and I measure its superiority with respect to the traditional individual testing strategy.
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