<s>[INST] <<SYS>> This is a medical question of type : frequency <</SYS>> How many people are affected by galactosialidosis ? [/INST] The prevalence of galactosialidosis is unknown; more than 100 cases have been reported. Approximately 60 percent of people with galactosialidosis have the juvenile/adult form. Most people with this type of the condition are of Japanese descent. </s>