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Hemophilia is an inherited bleeding, or clotting, disorder. People with hemophilia lack specific blood proteins, called factors, that are necessary for clotting. The two most common genetic factor deficiencies are factor VIII deficiency (hemophilia A) and factor IX deficiency (hemophilia B).
In the US, there are about 20,000 people with hemophilia. Each year, approximately 400 babies are born with the disorder. Most people with hemophilia are male, but women, who may or may not have symptoms, are carriers of the disorder.
There are three main forms of hemophilia:
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