Oxford: Risk of rare blood clotting higher for COVID-19 than for vaccines

Created on 2021-08-06T23:55:30-05:00

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In this study of over 500,000 COVID-19 patients, CVT occurred in 39 in a million patients.
In over 480,000 people receiving a COVID-19 mRNA vaccine (Pfizer or Moderna), CVT occurred in 4 in a million.
CVT has been reported to occur in about 5 in a million people after first dose of the AZ-Oxford COVID-19 vaccine.
Compared to the mRNA vaccines, the risk of a CVT from COVID-19 is about 10 times greater.
Compared to the AZ-Oxford vaccine, the risk of a CVT from COVID-19 is about 8 times greater.
There may also be under-reporting or mis-coding of CVT in medical records, and therefore uncertainty as to the precision of the results.