[Mass testing for Covid-19 : what can we learn from real-world implementation ?].

While several modelling studies suggest mass testing for SARS-CoV-2 could be effective, real-world attempts at implementation have not been sufficient to evaluate its contribution to controlling the pandemic. To slow the spread of the virus, a mass-testing campaign would need frequent testing over a prolonged period with high rates of participation, all while maintaining public health measures. Screening seems more useful for targeted populations or high-risk events (businesses, teaching facilities, public or private institutions, sporting or cultural events). With their low cost and rapid results, rapid tests should be favored for these interventions.