The results of one retrospective cohort study showed that very few people experienced a shoulder injury in 2016-2017 after receiving a vaccine dose. This is less than 1 person in 10,000 patients who received an intramuscular injection. All the results obtained by scientists were published in the Annals of Internal Medicine.
During the course of the study, specialists from the Department of Research and Evaluation of Kaiser Permanente in Southern California (USA) analyzed information on more than 3.7 million vaccinations. All vaccinations were delivered from April 2016 to December 2017. The researchers wanted to assess how likely a person is to get a shoulder injury as a side effect after vaccination.
Of the more than 3.7 million vaccinations given, there were only 371 cases where people developed shoulder disease. This is 0.99 people per 10,000 adults. As for children, this was even rarer among them: 4 cases for more than 750 thousand vaccinations.
Also, experts found that older people, females, with fewer comorbidities, were more likely to experience shoulder injury after vaccination. To this list, we must add another increase in the number of visits to the clinic six months before vaccination and the introduction of pneumococcal conjugate vaccine.
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