Yes, I got COVID a third time even after being vaccinated and boosted. The third time was mild compared to the first two times. It felt like a bad cold and I didn’t have nearly as many symptoms.
No long term side effects from the third infection, but I do have long term effects from the first and second infections. I now have asthma, chronic fatigue, gluten intolerance, possible MCAS, chronic respiratory issues, and I’m more susceptible to respiratory infections now. I was a perfectly healthy 30 year old before contracting COVID.