virus has higher risk of blood clot than vaccines, study finds – .

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virus has higher risk of blood clot than vaccines, study finds – .


TORONTO – The risk of developing blood clots is considerably higher and more prolonged if you contract COVID-19 compared to receiving the Oxford-AstraZeneca or Pfizer-BioNTech vaccines, according to a new study.

The study found that although there is a slightly increased risk of life-threatening clots for a short time after receiving a dose of AstraZeneca vaccine, the risks of such adverse events are almost 200 times higher if one is infected with the virus.

“People need to be aware of these increased risks after COVID-19 vaccination and seek medical attention promptly if they develop symptoms, but also be aware that the risks are considerably higher and over longer periods of time if they are infected. by SARS-CoV-2. “, Said Julia Hippisley-Cox, professor of clinical epidemiology and general medicine at the University of Oxford and lead author of the study, in a press release.

The study, published in the British Medical Journal on Friday, analyzed health data from more than 29 million people in the UK within 28 days of receiving their first dose of COVID-19 vaccine between December 1, 2020 and April 24, 2021. Approximately 19.5 million received a dose of AstraZeneca and 9.5 million received a dose of Pfizer. The data from these people was compared to that of around 1.75 million patients who tested positive for COVID-19 during the same period.

Overall, the researchers found that the risk of blood clots, low platelet counts and stroke was much higher and more prolonged during infection with COVID-19 than after receiving a dose of either vaccine.

Researchers have estimated that for 10 million cases of COVID-19 or vaccine inoculations, there would be 66 more cases of blood clots in the veins after a dose of the AstraZeneca vaccine compared to 12,614 among those infected with the virus.

Doses of AstraZeneca could introduce 107 more cases of low platelet counts compared to 934 in people infected with the virus, while Pfizer vaccine could cause 143 more cases of stroke compared to 1,699 cases among people with COVID- 19.

Jeffrey Weitz, executive director of the Thrombosis and Atherosclerosis Research Institute at McMaster University in Hamilton, Ont., Said the risk of clotting after the first dose of a COVID-19 vaccine remains low.

“I think this information should just inform individuals that they need to be vaccinated,” Weitz told CTV News Channel on Saturday. ” [Compared] not to be vaccinated, your risk of having a blood clot is at least 10 to 100 times higher. “

Many provinces in Canada suspended the deployment of the AstraZeneca vaccine earlier this year due to reports of an increased risk of rare but serious blood clots associated with low platelet levels.

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