This authored paper is garbage since this Vivid 19 has five strains a, b, c, d and e as reported. If by nature only, never could 5 strains be appeared to infect different countries at the same time! As a virologist myself, I know a virus would take months if not years to mutate into a new form through genetic drift! Then it has to be populated enough to establish a strain in order to have contagious development into a disease. So, definitely Vivid 19 stains are man made and conspicuously/experimentally infected different countries in conspiracy during peaceful time vs war time!!