Thanks for your comment. For the title, I think I'll stick with this one, unless you have a better one you can share with me.

I could be wrong, but I believe that anti-vaccine groups already have limitless materials to push their views. My article alone wouldn't make much of a difference. At least I hope this article is more scientifically sound, albeit imperfect, than the anti-vaccine articles they promote.

True, comorbidities are one confounding factor. Maybe people with medical comorbidities are more likely to get vaccinated, and such comorbidities also increase the risk of covid. But I've not seen such data at the point of writing this article.

I'm not sure if it's fair to compare polio vaccine to covid's though. I'm not familiar with polio vaccine, but I believe it's very effective, at least more so than Covid's. Plus, poliovirus doesn't seem to evolve vaccine-resistant traits like SARS-CoV-2 or, worse, influenza virus.