There is finally a relevant flu analogy for those people to use, but they completely miss it in favor of some other non sequitur:

Exposure to this years seasonal flu will give better immunity to this year’s seasonal flu, than the vaccine for last year’s seasonal flu will give to this year’s seasonal fly. One day we’ll be able to say “Duh” in response to annual COVID flavors.

There will be vaccines specifically made for the delta variant and others.