[epistasis]

You are right. Perhaps people saw "Pfizer" and made some assumptions based on Pfizer's work with the BioNTech mRNA vaccine.

Here, the originator of the vaccine is Valneva, which started their phase 1 trial in 2017:

https://www.newsweek.com/lyme-disease-vaccine-valneva-fda-ap...

[ghaff]

It's not just the OP. I've heard from multiple sources that "Pfizer has an mRNA vaccine for Lyme in clinical trials." Somewhere along the line someone(s) saw Pfizer, vaccine, and put 1 and 1 together and got 3. And it spread. This is the first time I realized that's not true.