I can't say I've experienced this but I've only had 3 vaccines. Since the actual vaccination contains an inactive COVID gene of the actual virus. Our body can still try to fight it off since it's something foreign entering our bodies. With MG whenever we get sick, or our body is trying to fight something unfamiliar that has entered it. It could possibly cause our MG to flare a tad. Have you discussed this with your doctor? Maybe he/she can shed some light of the concern. - Jazmin (MG team member)