A family of two-winged polluters that is, too often, tolerated within our homes.
Apart from the biting flies, all species feed by vomiting saliva on to the food surface, and sucking up the resulting liquid. In the course of doing so, the fly contaminates the food with bacteria from its gut and its feet. Thus, it may transmit food poisoning, dysentery, typhoid or cholera in countries where these occur.
The eggs of parasitic worms may also be carried by flies.
Blow flies are so called because they were believed to “blow” their eggs, or larvae on to exposed meats. It is a general description of a number of species of large buzzing flies, which include the Bluebottle, the Greenbottle and the Flesh Fly. They all like sunlight and are attracted to meat or carrion, and all may be found around dustbins in hot summer weather.
Their feeding habits (they vomit onto food to soften it up) and filthy feet, infect food, especially meat products, as they feed or seek egg-laying sites. Their Latin names indicate their habits; Calliphora vomitoria, Sarcophaga carnaria and Cyanomyia cadaverina are but three members of the group with a great capacity for transmitting the bacterial agents of food poisoning.