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Originally Posted by pip08456
I think he's spot on.
I suppose every variant of every virus has that potential but as I've asked before:- Can anyone name any virus in the history of man that has done this? I still await a reply.
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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