Multiple choice

Christmas disease is another name for _________.

  1. haemophilia B

  2. hepatitis B

  3. the Down's syndrome

  4. sleeping sickness

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is a blood clotting disorder caused by a mutation of the Factor IX gene, leading to a deficiency of Factor IX. It is the second most common form of haemophilia, rarer than haemophilia A. It is sometimes called Christmas disease

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