To this day, some people — including certain scientists — continue to question whether COVID-19 vaccines may be linked to various health conditions.
A recent large-scale study examined this question further.
This study was conducted by the Global Vaccine Data Network, involving more than 99 million people across eight countries: Argentina, Australia, Canada, France, Denmark, Finland, New Zealand, and Scotland.
Its findings were published in the scientific journal Vaccine.
Words From the Researchers (8/10)
“Most of the vaccinated individuals were between 20 and 59 years old, and France was the country where the highest number of doses were administered,” the researchers explained. The vaccines examined were produced by Pfizer, Moderna, and AstraZeneca.
These results added to the ongoing debates among healthcare professionals and patients alike.
Guillain-Barré Syndrome and Venous Thrombosis (9/10)
Researchers observed an increase in cases of Guillain-Barré syndrome (GBS) and cerebral venous thrombosis (CVT) following the first dose of the AstraZeneca vaccine.
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Guillain-Barré syndrome typically causes progressive muscle weakness.
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Cerebral venous thrombosis occurs when a blood clot forms in a vein in the brain, obstructing blood circulation.
French basketball player Victor Wembanyama previously suffered from a form of thrombosis, which forced him to end his season.
More Research Is Needed (10/10)
In addition, all vaccines showed an increased risk of myocarditis and pericarditis — inflammations of the heart muscle or its surrounding tissue — although these events remain rare.
“Other issues have been identified that require further research,” the journal notes.
Researchers emphasize that additional investigation is necessary to fully understand the relationship between vaccination and these adverse events.
Conclusion
COVID-19 vaccines were developed under urgent circumstances during a global health crisis.
After nearly five years of real-world data and scientific analysis, we now have a clearer — though still evolving — understanding of the possible side effects associated with these vaccines.
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