Thus the fly, as it buzzes indiscriminately from filth to human food or
human skin, transports to man or his food whatever pathogens may be contained in the
Fly droppings (fly specks) left on human food may be little more than highly
concentrated masses of organisms infectious to humans.
(2) Fly-spread diseases. The intestinal diseases, including the food
poisoning pathogens (with the possible exception of botulism), are highly subject to
transmission by flies.
Shigellosis is an example of an important intestinal disease that may
be mechanically transmitted by houseflies.
-- Respiratory diseases, particularly those transmissible by direct
contact with a case.
-- Respiratory discharges.
-- Skin lesions.
-- Moist fomites.
c. Control of Filth Flies. Flies may be controlled by eliminating their breeding
areas; screening living quarters, kitchens, and dining areas; and by applying
insecticides against adult flies. In the control of flies, a high level of general
environmental sanitation is implied.
(1) Control of breeding places. To eliminate fly breeding places:
All human waste, animal manure, and garbage must be covered,
disposed of, or treated promptly and effectively.
Field latrines and soakage pits should be constructed, used,
maintained, and closed so as not to foster fly breeding.
Fly breeding sites, which are identified, should be removed, and not
sprayed with residual chemicals.
(2) Control of adult filth flies.
The aerosol bomb may be used for quick knockdown and kill. When
correctly applied, it is very effective.
-- During application of the spray, windows and doors should be
closed and remain closed for from 30 to 60 minutes after the application.