I’ve heard about it. Know quite a bit about it. No one has seen any evidence of it with COVID-19.
What seems to be a mystery to some is the concept of variant-specific antibody resistance, where a change to the shape of a key protein (antigen) renders existing antibodies less effective. Exactly why COVID-19 reinfections are more common with Delta than previous variants as well. Even moreso than P.1 (Brazil). Thankfully still a rare issue (around 1 in 6,000 or so), but demonstrably more of a risk with Delta than any other variant.
The Delta variant includes multiple structural changes that are important when talking about neutralizing antibodies.
Which makes sense.
My area (eastern Iowa) was hit hard last November. Have a small increase now, but still lagging from where I expected it to be.
But we had a lot of naturally acquired immunity here. As in everyone had the vid in November .