Peter Attia· MD
Alternatively when they're just changing right so so of course like the flu you could get theoretically every year but that's because you're getting a novel pathogen effectively correct that's right and even then even the novelness of the pathogen is actually not as novel as a real phase shift in the antigens you're presented with like maybe would happen in h1n1 swine flu or a new bird flu so yes it's a spectrum all the way up to measles where it doesn't change that much even though it's an rna virus and you can get true permanent sterilizing immunity from natural infection for the rest of your life