Just as an update to my above and in case anyone is thinking / debating "should they get their booster or not?" - I had pzifer main jabs with a moderna booster yesterday with zero side effects or issues ( maybe a 5% sore arm where they injected it this morning, but that I'm guessing is just more to do with injecting ANYTHING into a muscle and is fairly standard. Either way, no issues, in an out in 2 minutes so if you're debating it - go get it done.