cilein:Christmas disease (aka Haemophilia B): An X-linked recessive genetic disorder that causes clo
cilein:Christmas disease (aka Haemophilia B): An X-linked recessive genetic disorder that causes clotting problems through missing or defective factor IX. Those affected bleed easier, and for longer.The name is actually based on the first patient described with the condition, and not the xmas holiday!A medical educational illustration summarising the features of Christmas disease to help with recognition of the signs, and memorising the info. -- source link