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).

SPS commentary:

A related editorial discusses this research highlighting that it puts into context concerns about the risk of bursitis with the influenza vaccine.


Annals of Internal Medicine

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