RE: Pfizer might be ready at end of October 202015 Sep 2020 14:53
Do103 is correct in what he says.
However the facts are that Coronavirus has been around for MANY years already, and has been mutating for many years too !
All virus's "change" over time, some change much more than others. The coronavirus labelled Covid19 is a strain of coronavirus which has been able to damage the human body to a greater degree than other strains of coronavirus historically.
So the fact that the virus has mutated into at least 30 strains is pretty normal. Flu does a simular thing. There are various strains of flu around the world at any one time, as with coronavirus. It's normal, It's how they behave.