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| | Christmas Factor (Site not responding. Last check: 2007-10-31) |
 | | The oldest blood diseases are referred to as hemophilia, and Hemophilia B, which is also known as Christmas Disease, is incurable, affecting approximately 2,800 Americans. |
 | | The name "Christmas Disease," in contrast to many medical diseases, comes from the surname of the family in which the disease was first studied and identified as a hereditary disorder in 1952. |
 | | R.G. Macfarlane used the patient's surname, Christmas, to refer to the disease and also to refer to the clotting factor, called the "Christmas Factor" (Factor IX), which is part of a complicated blood-clotting cascade. |
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