There isn't any ineligibility for vaccine. It's a patient/Doctor decision for those of us concerned. Since my Long COVID was caused by my first booster in November '21, every one of my Doctors exception one, advised to not take the vaccine again. I didn't need much encouragement because I had already made that decision. Never again and my self care tactic will be to carry Paxlovid with me when I travel internationally and only if I become seriously ill.