Thompson, I'm not sure that your description of a vaccine made from 'whole virus' defends against variants. By definition, the variants are not part of the original virus from which that vaccine was derived. There is of course a time element. After the vaccine is made from a particular virus at a particular date, the variants occur. No way can a vaccine anticipate the variant. To do that it would have to 'anticipate' what would happen, or attack a portion of the virus that remains invariant. By contrast, there are flu virus medications which attack all flu viruses such as Tamiflu, but you'll note it is a palliative, not a definitive 'cure' and flu vaccines come out every year and are not necessarily very effective.

We are all hoping that Covid-19 does not turn out to be a ready mutator such as flu. But we are learning it does mutate to some extent.

Please provide a source/ link for a statement such as yours.