Covid-19 as at August 2020 has spread globally awaiting a vaccine by December 2020. However whilst mutating to many virulent forms, Covid can also after many months mutate to a much milder form. A much milder form of Covid-19 may in fact become dominant over the existing and much more dangerous strains.  It would take another lengthy period of months before the dominant milder strain of the virus spreads  This could mean by June 2021 the virus will become like a normal flu, explaining how the 1918 pandemic slowly died out without a vaccine.