I was surprised to learn “original antigenic sin” is in fact a scientific term used since 1960.
I initially thought it was probably coined by anti-vaxers some of whom have said people getting vaxed need to pray for forgiveness.
I’m of the opinion, the same Lord that they count on to protect them from all illnesses, expects me to use my brain. And if I weigh the evidence and choose to get a vax, He is quite capable of protecting me from vax side effects as well, if he chooses. He is Soverign, it’s not like I control Him.