RT Journal Article SR Electronic T1 A “Needling” Problem: Shoulder Injury Related to Vaccine Administration JF The Journal of the American Board of Family Medicine JO J Am Board Fam Med FD American Board of Family Medicine SP 919 OP 922 DO 10.3122/jabfm.2012.06.110334 VO 25 IS 6 A1 Matthew G. Barnes A1 Christopher Ledford A1 Karen Hogan YR 2012 UL http://www.jabfm.org/content/25/6/919.abstract AB A 22-year-old woman with no significant medical history developed acute left shoulder pain and severe restrictions in range of motion after a seasonal influenza vaccine injection. Imaging by MRI, approximately 8 weeks after the injection, and by ultrasound, approximately 9.5 weeks after the injection demonstrated contusions on the humerus, injury of the supraspinatus, and effusion in the subacromial bursa. Her reaction was reported to the Vaccine Adverse Event Reporting System as a case of shoulder injury related to vaccine administration, likely due to injection of the influenza vaccine into the subacromial bursa. This case serves as a catalyst for discussion regarding vaccination technique and the potential to prevent complications arising from vaccine overpenetration.