@Genoshock the disease is very rare, the nobles have to build free hospital/clinic to attract commoner to diagnose their ill child there, and if you found them you still have to train them to make them usable
So not worth it
@Kaarme
Only nobles know about the disease
The reason why Frida know about the disease because her granpa is the head of merchant guild and has connection to the nobles
Even Benno doesn't know about the disease.
The disease is VERY rare and the people that get this disease died at young age