It is noticeable once more and once more that in families or partnerships “afflicted” by Sars-CoV-2, some people do not get sick at all. British scientists have now found laboratory evidence for the most likely cause: a cross-immunity of the persistently “pumpers healthy” with the Covid-19 pathogens through a previously experienced infection with “normal” coronaviruses. The research results might also have implications for vaccine development.
