Blood advances
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We report a case of vaccine-induced immune thrombotic thrombocytopenia (VITT) in a young man diagnosed 13 days after Ad26. COV2. S COVID-19 (Johnson & Johnson/Janssen) vaccination. ⋯ S vaccination presenting without radiographically-demonstrable thrombosis. Our patient highlights the importance of knowing vaccine status and initiating treatment as soon as possible in the right clinical setting, even in the absence of radiographic evidence of thrombus. Early VITT recognition and treatment provides an opportunity to prevent serious thrombotic complications.