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I had the moderna shot in April. I had zero side effects from either shot. I am in the Navy and was on duty the day of the second shot. Most of the guys were feeling very sick, had chills, etc. Very bad sides for them. I dont have much in terms of correlation as to why some people got sick or some didn't, but for myself and the other two guys that had no side effects, we were all bloodtype B-. Beyond that, side effects seemed to be pretty bad for everyone regardless of age, ethnicity, bodymass, or underlying health conditions.
I haven't heard much about covid and its relation to bloodtypes, but it would be interesting if someone compiled that data and found any correlation.