Risk for Subdeltoid Bursitis After Influenza Vaccination: A Population-Based Cohort Study
US database study (2,943,493 vaccinated persons) found a very small absolute increased risk of bursitis with influenza vaccine (attributable risk of 7.78 additional cases of bursitis per 1 million persons vaccinated).
Source:
Annals of Internal Medicine
SPS commentary:
A related editorial discusses this research highlighting that it puts into context concerns about the risk of bursitis with the influenza vaccine.