Blood clot risk much higher from Covid-19 than after vaccination: Study


 

The risk of developing adverse events such as blood clots is considerably higher after infection with the SARS-CoV-2 virus than after immunisation with Pfizer and AstraZeneca COVID-19 vaccines, according to a large UK study published in the British Medical Journal (BMJ) on Friday.

The team led by researchers at the University of Oxford in the UK conducted the study on thrombocytopenia -- a condition with low platelet counts -- and thromboembolic events or blood clots following COVID-19 vaccination with Oxford-AstraZeneca and Pfizer-BioNTech preventives.

Some of these events have led to restricted use of the Oxford-AstraZeneca vaccine, known as Covishield in India, in a number of countries.

The researchers compared rates of adverse events after vaccination with rates of the same events after a positive SARS-CoV-2 test result using data from over 29 million people in the UK who received the first dose of either of the two vaccines. Read More

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