"God in his wisdom made the fly
And then forgot to tell us why" )ogden
Nash). 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, treading it in 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,
typhiod or cholera in countries where these
occur. The eggs of parasitic worms may also
be carried by flies.
