It would be to maintain their language and culture, because they're the type of people who TREASURES their culture, and don't like to change just to fit in.
I hope I helped! =D

Some examples of communicable diseases are:-
1. Hepatitis A
2. Hepatitis B
3. Ebola
4. Flu
Sorry, I don't understand the question you're asking. Do you need help translating your answers? I can help with that but I would need your answers in English.