Signs and symptoms hemophilia A and B are nearly clinically identical, which makes sense since factors VIIIa and IXa work together in the coagulation cascade to activate factor X.

血友病A和B的体征和症状在临床上几乎相同，也说得通，因为因子VIIIa和IXa在凝血级联反应中，共同作用以激活因子X。