It is the mosquito that is the dispencer of disease, not the house fly. The house fly has garnered my respect in that it disposes of decaying matter that would otherwise be fetid with odor & disease. The maggot is used medically to clean unhealing wounds as it devours decaying, gangrenous flesh. Science has proven that the common house fly is not the deliverer of pestilence. Fleas, ticks, certain flies( tsetse fly, sand fly) & especially mosquitos carry disease.

The only good I can see from flies is when they lay eggs that turn into maggots that clean the rotten flesh out of an infected wound. They also eat something that is dead and rotting so I guess that could be considered good.

Maybe God is a fly, and we've got it wrong and it was them that she made in her image.