Wish I could be of some help to those that got the frozen shoulder! Fortunately, I just googled it and went the non-steroid route. I did the shoulder stretches with horrible pain as I learned you need to keep using and moving the shoulder. I graduated to light weights and I am proud to say my shoulder is fine. Have still not found any research on how much antibodies are developed when the vaccine is shot into the bursa. My doctor's at Mayo have no clue. Best wishes to those affected with this. Feel free to message me!