Everyone is familiar with house flies and mosquitoes. Flies regurgitate and excrete wherever they come to rest and thereby are ideally suited to mechanically transmit disease organisms. House flies are suspected of transmitting at least 65 diseases to humans.
Flies are common household pests, they visit dumps, sewers and garbage heaps, feeding on fecal matter, discharges from wounds and sores, sputum, and all sorts of moist, decaying matter such as spoiled fish, eggs and meat.
The filthy habits of each fly species make them easy vectors of diseases. Hookworm, whipworm, tapeworm, pinworm, roundworm, cholera, bacillary dysentery, infantile diarrhea, typhoid and paratyphoid are disease-causing organisms with which these flies are associated. Filth flies pick up pathogenic organisms from sewage, garbage, manure, decaying bodies and other such sources. These flying pests initially pick up dangerous organisms with their mouth and other body parts. The organisms are then passed on to humans and animals through the feces and vomitus of the fly.
Mosquitoes on the other hand breed on stagnant water accumulated on open water tanks, unused tires, pots, unattended kids toys at the garden to name a few. There are about 3,500 species of mosquitoes found throughout the world. In some species of mosquito, the females feed on humans, and are therefore vectors for a number of infectious diseases affecting millions of people per year.