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Haemophilia is a group of inherited blood disorders in which the blood does not clot properly.

Bleeding disorders are due to defects in the blood vessels, the coagulation mechanism, or the blood platelets. An affected individual may bleed spontaneously or for longer than a healthy person after injury or surgery.

The blood coagulation mechanism is a process which transforms the blood from a liquid into a solid, and involves several different clotting factors. The mechanism generates fibrin when it is activated, which together with the platelet plug, stops the bleeding. When coagulation factors are missing or deficient the blood does not clot properly and bleeding continues. Patients with Haemophilia A or B have a genetic defect which results in a deficiency in one of the blood clotting factors.

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