Flies are not only a nuisance pest but of greater concern is their potential as a carrier of disease organisms, having been found to harbour over 100 different pathogenic organisms.
House flies are general feeders, being attracted to a wide variety of substances from excrement to human foods. Because of their sponging mouthparts, they can feed only on liquids. However, through regurgitation they are able to liquefy many desirable solid foods. Also, a house fly excretes and regurgitates whenever it comes to rest. This habit coupled with its many body hairs and bristles and the sticky pads at the base of the claws on each leg make house flies well adapted for transporting disease organisms.
House flies have been shown to harbour over 100 different kinds of disease, many of which are associated with filth. Such pathogens include those causing
• Typhoid fever
• Salmonellosiso parasitic worms
They have been shown to be disease pathogen transmitters via their vomit, feces, and contaminated external body parts.