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Isn't it a big assumption that immunity is permanent? How would it affect the herd immunity threshold if a person can be reinfected every year?

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See fig 3 here: https://science.sciencemag.org/content/early/2020/04/24/scie...

Short answer, if the immunity is as short lived as current seasonal coronaviruses, it would be expected to recur in 2022 (hopefully with milder symptoms, but we can't know that yet).

Assuming immunity is both short-lived and predictably so for everyone. If the amount of immunity varies significantly by individual, then it’ll just be an ongoing slow burn and not another spike of infections. And that also assumes that at a slow burn it would be able to maintain R0 > 1.0.

Good point. If seasonal effects are strong enough, though, it might still recur in periodic spikes.

Is it possible to give someone known to have antibodies an live virus booster every six months?

In principle it might work, but there's no realistic chance doctors would get permission to administer or even test such a thing.

If you read down far enough, the site covers that!

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