How many people are affected by tyrosinemia ?
Worldwide, tyrosinemia type I affects about 1 in 100,000 individuals. This type is more common in Norway where 1 in 60,000 to 74,000 individuals are affected. Tyrosinemia type I is even more common in Quebec, Canada where it occurs in about 1 in 16,000 individuals. In the Saguenay-Lac St. Jean region of Quebec, tyrosinemia type I affects 1 in 1,846 people.  Tyrosinemia type II occurs in fewer than 1 in 250,000 individuals worldwide. Tyrosinemia type III is very rare; only a few cases have been reported.