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“We have all heard about the health problems caused by AstraZeneca vaccines, but a study conducted by the university claims that the Pfizer and Moderna vaccines are up to 30 times more dangerous …”, says a Facebook account of one Lithuanian social network.
Along with this message is a link to an article by Moscow propaganda speaker rt.com, which is based on a message posted on the Twitter account of the Russian vaccine Sputnik V.
The article examines a recent study by researchers at the University of Oxford. It is important to emphasize that the aforementioned study is still in a very early stage and has not been reviewed by other researchers.
The goal of this study was not to show which vaccine can increase the risk of blood clots, but to show that COVID-19 causes a much higher risk of blood clots than the risk of getting vaccinated.
The authors of the study, which included 513,284 patients with a confirmed diagnosis of COVID-19, reached the following conclusions:
- Twenty cases of cerebral venous thrombosis were detected in the study patients. This would mean that blood clots in the brain recur 39 times per million people with COVID-19;
- In an estimate of 480,000 patients vaccinated with Pfizer / BioNTech or Moderna (both mRNA-type vaccines), blood clots in this group recur 4 times per million people;
- Among people vaccinated with AstraZeneca, blood clots in the brain reappeared 5 times per million people;
- A person with COVID-19 is 10 times more likely to have a blood clot in the brain than a person vaccinated with an mRNA-type vaccine;
- People with COVID-19 are 8 times more likely to have a blood clot in the brain than those who are vaccinated with AstraZeneca.
Vaccines for COVID-19
It is true that when evaluating these findings, it is important to emphasize that they were obtained using data from different sources. Data on blood clots after vaccination with AstraZeneca was provided by the European Medicines Agency, while other data used in the study came from the TriNetX electronic health records network. For this reason, the researchers commenting on the study advised that the information be treated with caution, although this difference in data sources does not affect the conclusion that COVID-19 poses a significantly higher risk of blood clots in the brain than any of the three vaccines against the disease.
Given that the study authors themselves analyzed the data and found that AstraZeneca has a slightly higher risk of blood clots in the brain compared to an entirely different type, mRNA, why would a post on social media claim the exact opposite? ?
Digging deeper into the study’s findings, it can be seen that it assessed not only the risk of blood clots in the brain, but also hepatic portal vein thrombosis.
A study of this disorder found that COVID-19 could affect 436.4 times in a million people. Vaccination with Pfizer / BioNTech or Moderna has resulted in 44.9 cases of hepatic portal vein thrombosis in one million people. Meanwhile, vaccination with AstraZeneca had a significantly lower risk of the disorder, amounting to only 1.6 cases per million people.
Vaccines for COVID-19
Manipulating medical terms, social media and the Kremlin propaganda channel rt.com have concluded that the Pfizer / BioNTech and Moderna vaccines are 30 times more dangerous than the AstraZeneca vaccine, although in fact these data indicate a completely different health condition. : liver disease. venous thrombosis rather than the formation of blood clots in the brain, which have been the main source of criticism for AstraZeneca.
It is also important to emphasize that the study does not show at all that one vaccine is more dangerous than another or poses a risk to humans in general. The study sought to show that any of the three vaccines discussed had a much lower risk of blood clots than developing COVID-19.
Based on this information, the Lie Detector considers the statements that have appeared on social media to be misleading: a study by Oxford researchers did not conclude that some vaccines are more dangerous than other vaccines. Its objective is to demonstrate that both the vaccine developed by AstraZeneca and BioNTech / Pfizer or Moderna have a risk several times lower of cerebral venous and hepatic venous thrombosis than COVID-19.
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