Apparently CV has already mutated into two forms, a later L which is more virulent and an original S which is less. However, being more virulent is not necessarily worse. Because it tends to be picked up quickly as people fall ill and so it is more rapidly removed from the population. That’s why we don’t have the SARS which killed a very high number of people, but we do have flu, which kills many orders less of those people that it infects, but because it’s not enough to take the action to stop, the result is that it yearly kills more than SARS ever did. So, paradoxically the less virulent and deadly form of CV may end up being much more deadly (in terms of total deaths).
And it is too early to know whether immunity from one form gives immunity to the other or whether a vaccine can be developed for both.
