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The Danish Health Authority hosts a webinar with internationally renowned researchers to share knowledge and discuss the new syndrome VITT

On 29 April 2021, the Danish Health Authority will host an international scientific webinar on the syndrome 'Vaccine-induced immune thrombotic thrombocytopenia' (VITT). During the webinar, medical experts and researchers will share their knowledge and reflections on the new syndrome and discuss, among other things, epidemiology, diagnostics, and treatment of the syndrome.

28 APR 2021

The VITT syndrome is a rare side effect that has been observed following vaccination with the two COVID-19 vaccines from AstraZeneca and Johnson & Johnson, respectively. The syndrome is associated with a high mortality rate and severe illness.

"We would like to disseminate knowledge and open the floor to a professional debate. Despite a very short deadline, we are pleased to have succeeded in bringing together so many prominent and highly esteemed scientists, researchers and stakeholders to share guidance on the diagnosis and management of VITT in the healthcare system," says Søren Brostrøm, Director General of the Danish Health Authority.

On 11 March 2021, the Danish Health Authority elected to pause the use of the COVID-19 vaccine from AstraZeneca to investigate cases of a particular course of illness that gave rise to serious concerns. Since then, more knowledge and data has become available on the syndrome, not least through a Danish-Norwegian registry study.

The European Medicines Agency (EMA) has also confirmed that there is a possible link between the very rare but severe side effect: suspected vaccine-induced immune thrombotic thrombocytopenia (VITT) and Vaxzevria® (the COVID-19 vaccine from AstraZeneca) and the COVID-19 Vaccine Janssen® (the COVID-19 vaccine from Johnson & Johnson).


The international webinar is aimed at researchers, scientists, medical experts, etc. The webinar is open to all, and participation is free of charge.


The webinar is structured around four sessions consisting of a presentation followed by a discussion. The selected topics are epidemiology, pathophysiology, diagnosis, treatment and implications in relation to public health.

Practical information

Read more about registration and see the programme at sst.dk/webinar-vitt-en