Flies particularly are one of the most dangerous kinds of insect since they carry bacteria and other harmful micro-organisms from filthy places to our food. Flies are the carriers of diseases like cholera, dysentery, typhoid and other food-borne diseases. Flies are the filthy transmitters of disease because they have the habit of regurgitating food from their gut as they feed, and excreting faecal pellets on the food. The odor of decaying organic matter attracts flies the most.