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An inherited blood coagulation disease that has material basis in Factor IX deficiency, which makes coagulation much more prolonged. The disease is inherited as an X-linked recessive trait.
Haemophilia B, also spelled hemophilia B, is a blood clotting disorder causing easy bruising and bleeding due to an inherited mutation of the gene for factor IX, and resulting in a deficiency of factor IX. It is less common than factor VIII deficiency (haemophilia A). Haemophilia B was first recognized as a distinct disease entity in 1952. It is also known by the eponym Christmas disease, named af... Wikipedia