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I'm very curious what, exactly, you've read on this. by ndroman21

I don't know that I've ever given it much thought, but my understanding is that natural immunity is extremely variable between people, and certainly between different viruses

We've been able to essentially eliminate some diseases with childhood vaccines/booster shots. Yet we can't completely stop the flu, and we can't do anything about the common cold.

I am unaware of any consensus surrounding the general efficacy or effectiveness of vaccines vs. natural immunity taken as a whole. I'm not even sure such a conclusion is possible.

Isn't this the reason why it takes so long to develop and study vaccines?