[beefbudd69]

>The immunity can wane and the virus can mutate. Same reason you would get a shingles vaccine or a yearly flu shot.

aren't the current mrna vaccines based on the old 2019 variant of covid?

[nimih]

If you read exactly one additional sentence from my post you will see an acknowledgement of that very fact, as well as my justification for bringing up that line of reasoning in the first place. :)