It's very coincidental that my PMR started the time I took the first and second Moderna COVID-19 injections...I have since rec'd the first booster last Sept and got the second booster this week...experiencing a slightly sore arm and maybe a slight increase in "back ground pain & stiffness" in the late evening and during sleep...but that happens often. So in summary I'd submit no real change in symptoms since the 2nd booster (knock on wood)....