https://www.sciencedaily.com/releases/2020/09/200930094758.htm
https://www.sciencedaily.com/releases/2020/09/200930094758.htm
Fascinating research shows ancient vertibrates lines all have viruses endemically all the time- as normal, and this study shows that susceptibility to Covid-19 was set down when our line interbred with southern European Neanderthals and is hard wired in us.