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Originally Posted by mrmistoffelees
I think some of it's about right but it's being based on what we already know. Look at the changes from the Alpha to Delta variant which have occured in a period of just over a year.
Parts of the world are acting as petri dishes for potential new variants be that by relaxed restrictions or a lack of progress in vaccinations.
Quite simply, the more cases in circulation, the more chance of variants, the more chance of variants, the greater chance of one that becomes significantly more difficult to deal with.
The above doesn't mean i'm in favour of reimposing the restrictions that have changed most people's lives in the past eighteen months. But we also shouldn't discard their potential necessity just yet.
To answer your question? Documented? probably not as for large periods of history we didn't actually possess the knowledge to determine. Actually occurred ? more than likely
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In the history of vaccines the knowledge of any virus variant to evade vaccination would be known as it would have happened and been recorded.
To date I know of none that has unless you do.
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There’s already evidence of reduced immunity vs variants, and one poor sod who has been infected by original covid, alpha covid and delta covid despite being double vaccinated between alpha and delta.
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Reduced immunity is not vaccine evasion. Try again. The covid19 vaccines have never purported to prevent infection, just reduce the severity, need for hospitalisation and as a consequence death.