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Incidence of venous thromboembolism following COVID-19 vaccination

In a latest research posted to the medRxiv* pre-print server, researchers investigated the affiliation between genetic predisposition to venous thromboembolism (VTE) and elevated threat of thrombosis put up coronavirus illness 2019 (COVID-19) vaccination.

Study: Genetic risk and incident venous thromboembolism in middle-aged and older adults following Covid-19 vaccination. Image Credit: Vitalii Vodolazskyi/Shutterstock
Research: Genetic threat and incident venous thromboembolism in middle-aged and older adults following Covid-19 vaccination. Picture Credit score: Vitalii Vodolazskyi/Shutterstock

Venous thromboembolism (VTE) entails deep vein thrombosis and pulmonary embolism and predominantly impacts older people. VTE impacts almost 10 million folks globally yearly and results in appreciable morbidity and mortality. Though research have proven that COVID-19 vaccination is linked to the next threat of VTE, it isn’t clear if a genetic predisposition to VTE performs a task within the elevated threat of thrombosis post-vaccination.

In regards to the research

Within the present research, the researchers used UK Biobank (UKBB) knowledge containing data associated to in-depth genotyping knowledge and related vaccination and well being outcomes to generate a polygenic threat rating (PRS). They used 299 genetic variants recognized in a earlier research on giant genome-wide affiliation.

The UK Biobank is a potential cohort with greater than 500,000 people from England (89%), Scotland (4%), and Wales (7%) between 2006 and 2010. The age of those people at baseline enrolment was within the vary of 40 to 69 years. The Biobank knowledge comprised complete details about demographics, life-style components, socioeconomics, medical historical past, and bodily metrics collected utilizing questionnaires and standardized measurements.

The workforce prospectively evaluated associations between incident VTE and PRS put up first and second doses of COVID-19 vaccination. They carried out sensitivity analyses stratified primarily based on vaccine sort (mRNA or adenovirus vaccine) and used two historic cohorts that had been unvaccinated. The hazard ratios (HR) for PRS-VTE associations had been estimated utilizing Cox fashions.

Within the vaccinated cohorts, all UKBB members from England who had acquired at the very least one dose of ChAdOx1 or BNT162b2 COVID-19 vaccines between December 2, 2020, and September 31, 2021, had been included. The workforce adopted up the eligible members from the vaccination date to consequence, loss of life, or the top of the follow-up interval at 28 and 90 days, whichever occurred first. Individuals from Scotland or Wales weren’t included on this cohort due to the dearth of vaccination data on the time of this research.


A complete of 359,310 people acquired a single COVID-19 vaccine dose, of which 44.6% or 160,327 had been males, and the imply age was 69.05 years on the vaccination date. On 28- and 90-day observe up after first-dose vaccination, 88 and 299 sufferers developed VTE, respectively, which was equal to a 0.88 and 0.92 incidence price per 100,000 person-days. This affiliation between VTE and PRS barely decreased after the second dose vaccination within the 28- and 90-days follow-up interval.

The outcomes confirmed that the PRS was considerably related to an elevated threat of VTE. The workforce discovered related associations within the two vaccine dose cohort and the historic unvaccinated cohorts after stratification by vaccine sort. Of the 221,875 vaccine recipients whose vaccine-type data was obtainable, 172 83,816 acquired BNT162b2 and 138,059 acquired ChAdOx1. Related PRS-VTE associations had been noticed throughout every vaccine dose and follow-up interval. HR ranged between 1.24 and 1.63 within the ChAdOx1 cohort and between 1.20 and 1.38 within the BNT162b2 cohort.

Apparently, the VTE incidence charges within the BNT162b2 cohort had been almost twice as excessive because the incidence charges within the ChAdOx1 cohort. This was anticipated as a result of the BNT162b2 vaccine was authorised first within the UK and was prioritized among the many older, extra susceptible populations.


The research outcomes help a number of conclusions. First, the information confirmed that genetic susceptibility to VTE is a threat issue for VTE following COVID-19 vaccination. Second, this genetic susceptibility was unbiased of standard threat components together with weight problems, previous age, and comorbidity, as evidenced by the dearth of associations between the baseline traits and PRS.

Third, knowledge from the historic comparability arm means that clinically vital interactions are unlikely between the genetic background of people and COVID-19 vaccination. This has particular implications for hereditary VTE sufferers with predisposing traits who’re vaccine-hesitant attributable to issues associated to vaccine security alerts. Fourth, utilizing the genetic rating, the workforce discovered that 5% of the members had an over two-fold increased VTE threat, which is of nice public well being relevance as it might probably inform intervention insurance policies within the vaccinated inhabitants.

To summarize, the research findings present that the genetic determinants of creating VTE following COVID-19 vaccination are just like these present in historic knowledge. This means that post-COVID-19 vaccine VTE has the same etiology as standard VTE, on the inhabitants stage. As well as, the noticed associations between PRS and VTE had been equal for mRNA and adenovirus-based COVID-19 vaccines.

*Vital discover

medRxiv publishes preliminary scientific experiences that aren’t peer-reviewed and, due to this fact, shouldn’t be considered conclusive, information medical observe/health-related habits, or handled as established data.


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