 Switzerland has one of the highest COVID-19 cases per capita in the world and undetected SARS-CoV-2 infection is likely due to limited testing capabilities. Testing alone cannot stop the spread of the virus, and a combination of rapid diagnosis, isolation of cases, and contact tracing is recommended by the World Health Organization to control COVID-19. This article was authored by Marcel Salathy, Christian L. Althaus, Richard Nair, and others.