Flies create some of the most common public-health insect problems. In the United States they can be a major source of mechanically transmitted diarrheal illnesses and occasional cuticular disorders, such as pinkeye. Because they can be associated with human excreta, flies can become involved in enteric (intestinal) disease cycles. Besides being annoying, some biting fly species may transmit pathogens that cause tularemia.
Food service establishments must only use insecticides registered for application in a food service establishment and must apply insecticides according to label instructions and food service regulations.