Since February, 2021, multiple countries have reported cases of Thrombosis with Thrombocytopenia Syndrome (TTS) in persons who received the COVID-19 vaccine. To further our understanding of a possible association of cases observed with thrombocytopenia and thrombosis following receipt of COVID-19 vaccines, Brighton Collaboration has developed the following interim case definition. The purpose of this interim case definition is to identify individuals that could then be studied using a common study protocol and assessment.
If you have any comments on the interim case definition, please submit them here. Note that unless there is a strong reason to do so, we’ll postpone incorporating them until development of the final case definition.