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That’s wrong information.

Twice-vaccinated people will have to get a booster shot and there are discussions about a six month expiry date if you don’t get the booster shot.

What happens beyond that we do not know right now since can’t look into the future. We do not know how effective the booster will be in terms of long-term protection.

All of that is not surprising. A bit annoying but not surprising.

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if it's the same shot as the originals, which is my understanding, then it's reasonable to assume a similar expiry

No, not at all. That’s not at all how it works.

Other vaccinations are also given three times (second dose after a short interval, third dose after a longer interval), so it might well be that this vaccine turns out to be one of those, we just do not know. That’s the point.

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