Covid-19 vaccine: four years later, the list of persistent symptoms is growing

Cerebral venous sinus thrombosis (CVT) / Thrombosis with thrombocytopenia (VITT/TTS)

• What: Blood clots in brain veins sometimes accompanied by low platelet counts (can be life-threatening).

• Which vaccines: Adenoviral-vector vaccines (AstraZeneca, Johnson & Johnson) were most commonly implicated in VITT/TTS reports.

• How common: Very rare, but severe — prompted temporary pauses and age-specific recommendations in some countries when first identified.

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