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The Centers for Disease Control and Prevention (CDC) issued a April 13, “Cases of Cerebral Venous Sinus Thrombosis (CVST) with Thrombocytopenia after Receipt of the Johnson & Johnson COVID-19 Vaccine.” The alert shares information about the identification of six cases of CVST, a rare and severe thrombotic event. The American Society of Hematology also has released “Immune Thrombotic Thrombocytopenia: .”