Study on the risk of blood clots from Covid-19 vaccines

A new study published in the Journal of Clinical and Translational Science refutes the claim that coronavirus vaccines carry a high risk of blood clots.

A fairly widespread concern associated with the Covid-19 vaccination was the risk of thrombotic thrombocytopenia. This is a rare condition that causes blood clots to form in the blood vessels. Indeed, the fears were not unfounded – many cases of thrombosis or pulmonary embolism occurred after the use of vaccines based on adenovirus vectors. Later, vaccine-induced thrombocytopenia (HITT) was recognized as a rare complication of vaccines based on specific adenoviral vectors.

The CDC – the Centers for Disease Control and Prevention – also favored mRNA vaccines, which in turn strengthened the opponents of vaccination. A recent study by scientists at the University at Buffalo in New York aimed to find out if people are at higher risk of developing blood clots with the Covid vaccine.

The WHO estimates that the coronavirus has killed 6,908,554 people worldwide. To date, a total of 13.3 billion doses of vaccines have been administered. The study sample size was 855,686 people aged 45 and over who received at least one dose of the Covid vaccine. There were 321,676 people in the control group who were not vaccinated. None of the participants tested positive for Covid.

The results of scientific work have shown that there is a slight increase in the risk of blood clots with the current Covid-19 vaccinations used in the United States in people over 45 years of age. The risk is significantly lower than the risk of venous thromboembolism (VTE) among hospitalized patients with Covid or other risk factors for VTE.

The final resolution noted that clinical net benefit favored vaccination and should be encouraged. Study lead author Peter Elkin noted, quotes CNN Greece:

“The excess risk was about 1.4 cases per million vaccinated patients. Given that the rate of VTE (venous thromboembolism) in COVID-19 is much higher than the negligible risk from vaccination, our study confirms the safety and importance of timely vaccination against COVID-19.”

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