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The results were published in the  scientific journal Vaccine , a reference point for the international medical community. According to the authors, most of the vaccinated subjects studied were between the ages of 20 and 59, while the highest number of doses administered was recorded in France.
The vaccines analyzed in the study are those produced by  Pfizer, Moderna, and AstraZeneca , the most widely used during the emergency phase of the pandemic. This global observation effort, however, did not allay all concerns. The researchers did, in fact, identify some risk signals associated with vaccine administration.
Specifically, after the first dose of AstraZeneca, an increase in cases of  Guillain-Barré syndrome  and cerebral venous thrombosis was observed  . The former is a neurological condition characterized by progressive muscle weakness, while the latter involves clots that impede normal blood flow. This condition, in recent months, also affected French basketball player Victor Wembanyama, who was forced to retire for health reasons.
The study also notes that all the  vaccines analyzed  showed a statistically significant increase in the risk of myocarditis and pericarditis, which are inflammations of the heart muscle and its lining membranes. Experts note that these are rare events, but sufficient to warrant further investigation. The authors emphasize that the speed with which the COVID-19 vaccines were developed was a necessary response to an unprecedented situation.