No side effects

Amanda Stephine • 28, Canadian 🇨🇦 Proud 🏳️‍🌈 Protect abortion rights💕

I recently got my second dose of covid vaccine on the 24th. I had pfizer first and moderna second, if that matters. Alot of people I know have been complaining about severe side effects and flu systems. I, however have felt fine other than a sore arm. Anyone else never had side effects and can someone explain why no side effects occur? Is it due to weaker immune system, stronger, neither?