Blood clot risk 'considerably higher' for those who DON'T have Pfizer or AZ vaccines

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The finding, which came from more than 29 million people, showed there is still a risk after having the jab – but it is “considerably higher” in someone who has the virus. The researchers, from the University of Oxford, are fully independent of the team that worked on the AstraZeneca jab. It comes after heightened concerns earlier in the year led to the restricted use of the AstraZeneca vaccine in a number of countries.

The new research, published in the British Medical Journal, found for short time intervals after the first dose there were rare cases of hospitalisation or death from blood clots.

But, importantly, they also found the risk of these adverse events is substantially higher and for a longer period of time, following infection from coronavirus.

Julia Hippisley-Cox, lead author of the paper, said: “People should 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 become infected with SARS-CoV-2.”

All the vaccines currently on offer to fight COVID-19 have been tested in randomised clinical trials, which are unlikely to be large enough to detect very rare adverse events.

The risk of blood clot was found to be higher in those that caught Covid

The risk of blood clot was found to be higher in those that caught Covid (Image: GETTY)

Data was analysed from 29 million people

Data was analysed from 29 million people (Image: GETTY)

When rare events are uncovered, regulators perform a risk-benefit analysis of the medicine to compare the risk of the adverse reaction, such as a blood clot, against the benefits of avoiding the disease.

For this paper, the researchers used routinely collected electronic health records to evaluate the short-term risks (within 28 days) of hospital admission from blood clots.

They used data collected from across England between December 1, 2020, and April 24, 2021.

Professor Hippisley-Cox added: “This research is important as many other studies, while useful, have been limited by small numbers and potential biases.

“Electronic healthcare records, which contain detailed recording of vaccinations, infections, outcomes and confounders, have provided us with a rich source of data with which to perform a robust evaluation of these vaccines, and compare to risks associated with COVID-19 infection.”

READ MORE: Coronavirus breakthrough as AstraZeneca hails results of vaccine alternative treatment

Both AstraZeneca and Pfizer were studied

Both AstraZeneca and Pfizer were studied (Image: GETTY)

In March, concerns were raised over blood-clotting events associated with the AstraZeneca vaccine.

One month later, the safety committee of the EMA concluded that there may be a link between the AstraZeneca vaccine and very rare cases of unusual blood clots.

These rare blood clots occurred in veins in the brain, the abdomen and in arteries, in combination with low levels of blood platelets.

The announcement came on the heel of dozens of European countries, including Germany and France, suspending their use of AstraZeneca.

French President Emmanuel Macron openly denigrated the AstraZeneca vaccine in January, calling it “quasi-ineffective”.

The repercussions are said to have had a disastrous impact on the European and the global vaccination campaign.

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There have been some very rare cases of blood clotting

There have been some very rare cases of blood clotting (Image: GETTY)

Emmanuel Macron came under fire for his assessment

Emmanuel Macron came under fire for his assessment (Image: GETTY)

The new data comes after AstraZeneca hailed the results of vaccine alternative treatment.

The antibody therapy reduced the risk of participants developing COVID-19 symptoms by 77 percent, according to the drugmaker.

It opens up the door to an alternative option for people who may not see the full protective benefits from the currently authorised vaccines.

The PROVENT pre-exposure prophylaxis trial showed AZD7442 could potentially provide long-lasting protection with demonstrated clinical trial success.

AstraZeneca said that 75 percent of participants in the stage three trial — comprising two types of antibodies that were discovered by Vanderbilt University Medical Centre in Tennessee — had chronic conditions, including some with a lower immune response to vaccinations.

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