> EDIT: The mRNA vaccines are obviously not therapeutic antibodies, but they probably checked for cross-reactivity of the engineered spike protein as well as the generated antibodies using similar methods. I’m not 100% sure, though.
There is a study[0] showing cross-reactivity between SARS-CoV-2 antibodies and other human tissues, thus predisposing the host to autoimmune diseases. This should apply even more so to any vaccine since vaccines produce a more robust immune response.
Phase 2/3 of Pfizer-BioNTech did, however, include people with autoimmune diseases [1]. Other vaccine trials did not, as far as I am aware. This does not really shine a light on pre-disposition to an autoimmune disease 6-9-12 mo down the road.
Reading this comment again before I post made me realize it sounds very gloomy, so I feel obliged to say I'll be getting whatever vaccine I can get my hands on at the soonest possible date.
[0] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7246018/#__ffn_...