Does the particular tracking strategy of Asian countries allow them to avoid the new wave of Covid-19 which is overwhelming Europe? While this is obviously not a miracle solution – Japan is also experiencing an upsurge in cases – it could help better control the circulation of the virus. In France, when a person tests positive, Medicare investigators will seek to find out who they may have infected. In South Korea, China, Singapore or Japan, investigators take the problem the other way and seek to find out from whom the person was infected. The objective: to go back to the source of the infection, to patient zero and to the place where the cluster may have formed, in order to then be able to prevent (and isolate) those who were present at that time, or who were in contact with the source.
This so-called “retrospective” tracing, already in practice for tuberculosis or measles, is based on how the virus is transmitted. As explained