Just wondering really if we will be able to tweak a vaccine to potentially cover all strains in the future? If the SA one requires us to tweak the vaccine (not proven by scientists yet to be the case) then presumably we may have to tweak again and again as new strains become known to us? Would this mean the current vaccine which is in use today would need to be followed by the tweaked one(s)? Any scientifically minded folk out there know? Thanks