I had the Anthrax series and gave it to thousands of troops with no series reactions. But that vaccination had been around for over 2 decades, and if I remember right, had a vastly lower risk of series side effects compared to the current Covid 19 vaccinations available in the US.
These current covid 19 vaccinations unfortunately cause your body to produce the business end of the virus (the part of the virus that not only attaches to your cells, but which also causes serious dysfunction in the body like coagulopathies, myositis, etc.