I too had a flu shot that hit the bursa and resulted months later in a steroid shot to relieve it. This year I learned a new lesson. Due to a hyper-reactive inflammatory response in my body, no more injections of any kind in that arm. The flu shot this year was in the correct spot, but the bursitis has flared again. Trying to wait it out but may end with another injection. My primary and the pharmacist now told me no more injections in that arm.
The lessons we learn!
Sue