Aside from being an annoyance, these insects pose many health risks to you and everyone else who lives in your house. Their droppings are often called “flyspecks” because they look like small specimens of dirt or sand, but if left alone they will accumulate over time.
In addition to being unsightly, they can also cause quite a few health problems:
They often carry harmful bacteria and other pathogens on their legs, which are passed onto every surface they land on or crawl across.
They feed by walking or crawling over the food you eat, leaving behind saliva that contaminates your food and spreads disease.
The adults lay eggs in organic waste at a rate of roughly one egg per 0.05 grams of feces, which means that even a small piece of fruit lying on the ground could have hundreds of larvae attached to it when flies are around.
While these insects may seem harmless when outside near your garbage bins or in nature, it's important to remember what they can do to the inside of your home.