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I understand that some vaccines need boosters, and for most of these it makes sense. You're not constantly exposed to rabies so over time the protection will wear off. But with covid, it's still going around. Aren't our immune system's constantly being refreshed by being exposed to covid naturally?

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    Prior research is required here. Does exposure to the virus that's insufficient to cause infection provide any immunity? I think you need to answer that question before asking this one.
    – Carey Gregory
    Sep 19 at 4:07
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    Also, what does "it's still going around" mean in terms of an individual's exposure?
    – Armand
    Sep 19 at 18:09

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