Flies can be both a nuisance and a health risk. They have been known to spread illnesses including typhoid fever, cholera, and many others. Most commonly this will happen when a fly lands on human or animal fecal matter, and then later lands on food or in water. In this way bacteria are transferred from the fecal matter to the human via the fly, and it often goes unnoticed. It is important for any business to control flies, particularly food handling establishments, food processing facilities, and food storage facilities.