activating your immune system is the point. 2-3 days of mild symptoms is fairly common with plenty of vaccines https://twitter.com/odotjdot/status/1351849967661449217
in fact, most of the symptoms we associate with sickness are actually the effects of your body’s immune system fighting back, not directly caused by the infection.
fever: your body trying to boil the invader out of you (assuming <98° will kill it)
chills: counteract the fever so you don’t boil your brain too
aches: increased blood volume bc of all the extra immune cells, higher pressure on your vessels
mucus/cough/sneeze: your body trying to coat and expel the infectious material from your respiratory pathways.

so when you’re vaccinated, they don’t all happen to everyone, but they are to be expected. bc that is evidence your immune sys. is functioning
oh and fatigue: all the extra activity of your immune cells uses a LOT of energy, so it’s diverted. less to muscles, more to the infection
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