"presumably this entire pandemic started from a single viron" I have no idea where you get this from. It is likely that someone got bit or scratched or sneeze

"presumably this entire pandemic started from a single viron" I have no idea where you get this from. It is likely that someone got bit or scratched or sneezed on by a bat or cat of some type at the Wuhan "wet" market. Or they caught it somewhere else from a bat or cat but went to the "wet" market and spread it in the asymptomatic period.