How would anyone know what a “RARE” reaction to a so-called vaccine when it is still in the emergency stage?
This sort of thing can be caused by an auto-immune disorder or a severe allergic reaction. These novel vaccines based on viral fragments certainly could cause either.
He developed Stevens-Johnson Syndrome which is itself rare and is, rarely, associated with other vaccines as well. I saw it once with a young child who developed it after an antibiotic back in 2004.
STEVENS-JOHNSON SYNDROME is a rare reaction to ANY medication. There are several medications that are known to be more causative. But just about any medication can cause it. That is why in most all OTC and prescribed meds there is the warning to contact a medical provider if a rash appears.