HIV crossed from chimps to humans in the 1920's in what is now the Democratic Republic of Congo. This was probably as a result of chimps carrying the Simian Immunodeficiency Virus (SIV), a virus closely related to HIV, being hunted and eaten by people living in the area.
Answer:
limit the bug bites and contact with infected birds
Explanation:
One way they could limit the bites is a way ther're already doing it with bug screens when they sleep over the beds, that and bug spray.
the birds could be solved with feeding stations outside of civilizations and scarecrows in the towns.
Fun fact: i don’t think any of us asked