Covid and long covid may depend on virus able to reach to locations where ACE2 and TMPRSS2 are exoressed and complications therefrom. These as I indicated in my previius posts. However i think I can explain my tooic subject by this example: Suppose a jungle enable existance of 10 lions whose vitality is sbout 50 years. Another jingle enable existance of 50 dogs whose vitakity5 is 10 years. Though overall existance is same i.e. 10x50, 50x10= 500 but though dogs are also dangerous to us but still they are considered friendly to human beings due to their lesser severity than lions. Ssne with covid 19/Delta vs Omicron.