Discussion
In this nationwide population-based study...the incidences of...inflammation-related disorders involving tendons and connective tissues, were higher in the vaccinated group than in the unvaccinated group, regardless of the type of vaccine received. At 12 weeks after vaccination, all inflammatory musculoskeletal disorders investigated...showed a higher incidence in the vaccinated group than in the unvaccinated group...
Regarding the inflammatory musculoskeletal disorders investigated in this study, the incidence rates of shoulder-related disorders...were notably higher than those of other disorders... We believe that shoulder injury related to vaccine administration (SIRVA)...may have contributed to the high incidence rates observed. SIRVA is thought to occur by provoking an inflammatory reaction when vaccines are injected through the deltoid into underlying non-muscular tissues. Subsequent prolonged inflammatory responses...could progress to bursitis, tendinitis, and capsulitis around the shoulder joint."
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