events of Immune Thrombocytopenia (ITP) with no evidence of congenital or genetic thrombocytopenia, and no simultaneous neutropenia, pancytopenia, bone marrow involvement, anemia. Persons exit after 180 days or when they have normal platelet count. Also no evidence of common causes of thrombocytopenia including hypersplenism, antiphospholipid syndrome, paroxysmal noctural hemoglobinuria, hemolytic uremic syndrome, thrombotic microangiopathy, major autoimmune disorders, chronic liver disease, pregnancy HELLP, tumors of hematopoietic cells or nutritional deficiency