Harvard professor Michael Mina illustrates in his article “Rethinking Covid-19 Test Sensitivity — A Strategy for Containment” how we should look at rapid testing, sensitivity and COVID-19 infectivity. It is fundamentally important to understand what different COVID-19 testing results actually mean. Do we want to detect genetic material of the novel SARS-CoV-2 virus? Then a test with a high analytic sensitivity would be appropriate, in this case the PCR method. But do we want to screen a lot of people for infectivity? In this case a test with a lower analytic sensitivity would be the best option. The reason for this is that in the phase in which persons are not infectious (post infectious), PCR would (falsely) turn positive for some indefinite time. This and many more is described in this very interesting article by Mina, published in the NEJM.