Human Health and DiseaseMediumBloom L1
Question
Christmas disease is another name for
Options
A.Down′syndrome
B.sleeping sickness
C.haemophilia-B
D.hepatitis-B
Solution
(b) [Key Concept: Christmas Disease — Haemophilia B] Christmas disease is another name for Haemophilia B (Factor IX deficiency), named after Stephen Christmas, the first patient in whom it was described (1952). Haemophilia B is an X-linked recessive bleeding disorder caused by deficiency of clotting Factor IX (Christmas factor). Haemophilia A is Factor VIII deficiency. Both are X-linked recessive disorders causing prolonged bleeding.
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