<s>[INST] <<SYS>> This is a medical question of type : frequency <</SYS>> How many people are affected by galactosemia ? [/INST] Classic galactosemia occurs in 1 in 30,000 to 60,000 newborns. Galactosemia type II and type III are less common; type II probably affects fewer than 1 in 100,000 newborns and type III appears to be very rare. </s>