Cerebral venous sinus thrombosis (CVT) / Thrombosis with thrombocytopenia (VITT/TTS)
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What: Blood clots in brain veins sometimes accompanied by low platelet counts (can be life-threatening).
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Which vaccines: Adenoviral-vector vaccines (AstraZeneca, Johnson & Johnson) were most commonly implicated in VITT/TTS reports.
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How common: Very rare, but severe — prompted temporary pauses and age-specific recommendations in some countries when first identified.
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