House flies a well-known cosmopolitan pest of both farm and home. This species is always found in association with humans or activities of humans. They can also transport disease-causing organisms. More than 100 pathogens associated with the house fly may cause disease in humans and animals, including typhoid, cholera, bacillary dysentery, tuberculosis, anthrax ophthalmia and infantile diarrhea, as well as parasitic worms. Pathogenic organisms are picked up by flies from garbage, sewage and other sources of filth, and then transferred on their mouthparts and other body parts, through their vomitus, feces and contaminated external body parts to human and animal food. The housefly has a complete metamorphosis with distinct egg, larva or maggot, pupal and adult stages. It can complete its life cycle in as little as seven to ten days, and as many as 10 to 12 generations may occur in one summer.