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The only thing that hopefully stops it is Omicron which will gives us natural immunity.
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You can hope but the same thing that allows Omicron to evade the neutralizing antibodies from vaccines allows it to evade the neutralizing antibodies from prior infection (they are the exact same thing). We don't have enough time to see if omicron can beat prior infection with omicron but early research suggests it is far more likely than delta to re-infect.
And that's ignoring whatever possible mutations will still occur.
