The flies are disease carriers bring to people. It is in saliva bacteria on it right by our food the germs they would be on the food. When we eat a piece of it to get the infection.
Fly-borne disease to us. The bacteria in saliva, it will have when it gathered our food pathogens, those on a diet. When we eat food into pieces that will get infected with it.
The flies are disease vectors to people. The saliva will carry bacteria when it with our food pathogens, they will be on the food. When we eat a piece that will be exposed.