Research aims to tackle vaccine blood clotting threat

As the world looks to tackle the threat posed by the omicron variant, researchers in the UK have announced a new programme which will look at one of the rare but serious side effects of vaccination.

The programme, led by the University of Liverpool and supported by the National Institute for Health Research (NIHR) it to enhance the understanding of the rare but serious condition of blood clotting with low platelets following vaccination for COVID-19.

Most people who experience a side effect from COVID-19 vaccination have only mild reactions lasting for two or three days. However, in March 2021 reports of small numbers of people being admitted to hospital mainly after the AstraZeneca vaccine with what could potentially be a very rare side effect of vaccination began to emerge. These people had blood clots in the major veins in the brain, abdomen, or elsewhere in the body, but at the same time, a low level of platelets – which are responsible for clotting – in the blood.

Researchers, from eleven different institutions, supported by a wide range of collaborators within the NHS and national agencies, will work together to study the mechanisms underlying the occurrence of blood clots with low platelets – known as thrombotic thrombocytopenia syndrome (TTS).

This project is supported by the NIHR and backed by funding from the Vaccine Taskforce.

Professor Andy Ustianowski, NIHR Clinical Lead for the COVID-19 Vaccination Programme and Joint National Infection Specialty Lead, said: “The benefit of COVID-19 vaccines still far outweighs the risks, but it’s important we understand more about the biology behind TTS and why COVID-19 vaccines can lead to it in these rare cases.

“This research is vital to help find some answers to prevent and treat TTS, and further improve the safety of current and future vaccines.”

Chief Investigator Professor Sir Munir Pirmohamed said: “The combination of blood clots with low platelet levels is very rare,  and although it has been reported previously – including before the pandemic – the clusters of cases were unusual and an association with the vaccines was suggested. It is important to note that the vast majority of individuals given the vaccine do not develop TTS – but between 1 in 100,000 and 1 in a million do. We do not yet understand why a vaccine that is safe for almost everyone can cause TTS in particular individuals.

“Our research will help understand why COVID-19 vaccines can lead to TTS in rare cases.”

The researchers and doctors from across the UK will combine their expertise to understand the biology behind TTS and develop solutions to prevent and treat TTS.  This will involve using information in electronic health records to understand underlying diseases, vaccine safety and effectiveness, explore how the immune system and the genes controlling the immune system respond to viral infection and vaccination, understand how and why blood clots form and the effectiveness of treatments for people who suffer these rare blood clots.

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