BTW does the same hold true for people who are vaccinated? Do they also not acquire natural immunity when they fight off the virus?
I haven’t seen a report on what happens if you’re vaccinated and then catch and recover from delta or omicron, but it seems to me that you would be in the position of someone who has recovered naturally, and should have gained natural immunity. But that’s just my guess and there could be some factor that I’m not aware of that could interfere with it. Now that you have me curious about it I’ll be watching for what I can find on PubMed.
One problem that can exist with relying on natural immunity is that it’s possible to recover from covid without developing robust antibodies. A weak immune system or maybe having had a mild case could fail to train your immune system.