I never realized that flies could carry such diseases for humans and animals. For me, I just saw them as pesky creatures who were annoying.
We have horses, so always get more than our share of flies. I have always called them horse flies, because they are much bigger than the regular house flies.
We spray them for flies in the summer, but this is more for their comfort than worrying about the flies giving them any kind of disease.
I am sure our horses are glad when the first frost comes and they aren't bothered with these flies for the rest of the winter.
It makes you wonder how the people who don't have a choice to escape the African tsetse fly deal with it on a daily basis. We live in enclosed, air conditioned houses and only have to worry about one or two flies getting in the house.
If you had to live with these flies every day, it would not only be annoying, but also harmful to your health.