....and what else, dazzlenation?....'delta'....i don't really understand how it can 'knock out' the other viruses, as yet but anyway, i've read that before now, upon the internet....perhaps it is more a case of so many people having built up a resistance to the previous viruses...to the extent that they tend to die out?...unless of course, you see the virus as a 'living organism'....parts of it mutate....and the parts that are still effective, let us say.......a bit like a parasite taking over a 'host' i.e. a human being....to then become the dominant strain?....which means we are talking about 'survival of the fittest' in terms of the virus itself, as a sort of multitude....of parasitical etc etc...some manage to mutate but others do not etc etc but that still doesn't quite explain the idea that it can 'knock out' the strains which are no longer etc etc....anyway, more 'bad news'...go figure:

'Delta is making other COVID variants extinct' - but what does it mean for the UK? (msn.com)