Quote:
Originally Posted by nffc
Considering for this to happen, you would need vaccine escape through a new variant which can evade the vaccine immunity, and this would also likely evade the immunity from infection with other variants, it would also need the transmissibility advantage over delta, so it would need to be basically delta with immunity escape. We did of course have a variant which could evade previous infection and immunity from vaccines but it lost out and doesn't really circulate any more.
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So basically it needs to be able to do to Delta what Delta did to Alpha?
It doesn’t strike me as particularly unconcerning, given infinite time and billions of opportunities against weakening efficacy (all vaccines).