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VITT/TTS vaccine side effects

Vaccine-induced immune thrombotic thrombocytopenia (VITT) and thrombosis with thrombocytopenia syndrome (TTS) as side effects of COVID-19 vaccines

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Jan 11, 2026
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What are the current incidence estimates of thrombosis with thrombocytopenia syndrome (TTS) after adenoviral‑vector COVID‑19 vaccines by age and sex?

Thrombosis with thrombocytopenia syndrome (TTS) after adenoviral‑vector COVID‑19 vaccines is a very rare event whose reported incidence varies by vaccine, age group, sex, surveillance system and study...

Jan 22, 2026

Is the incidence of vaccine-induced immune thrombotic thrombocytopenia (VITT) different long-term between J&J and AstraZeneca compared to mRNA vaccines?

Vaccine-induced immune thrombotic thrombocytopenia () has been repeatedly and robustly linked to adenoviral‑vector COVID‑19 vaccines—principally ’s ChAdOx1 and, to a lesser extent, ’s Ad26.COV2.S—whil...