Question

The disease not transmitted by house-fly is
A. Dysentery
B. Cholera
C. Enteric fever
D. Dengue fever

Answer 1

Hint:House Flies lay eggs mostly in animal manures or decaying matter. These sites are home to hundreds of parasites. Flies act as a vector as these parasites stick externally to housefly hair or ingested. Houseflies regurgitate and that causes serious spread. A disease transmitted by a female Aedes mosquito is not transmitted by a housefly.

Complete answer:
Houseflies are found everywhere from hovering over animal manures to the dishes having delicious meals. The female house flies around 500 eggs in her lifetime. Eggs are laid on the dead and decaying matter such as food waste, feces, or animal manure. These eggs hatch to form larvae which feed on the place where they have been laid. This helps in waste recycling or organic matter. As larvae develop to form adult houseflies they fly to places where rich nutrition is available. These sites usually contain feces, carrion, decaying matter, decaying food, etc. These sites are rich in parasite strains of microbes. These parasites stick on the hairy body of the housefly or they get ingested by the housefly.
The housefly is not a secondary vector and thus it does not store the microbes inside its body. Housefly regurgitates and excretes wherever it rests. The resting surface includes human skin, food, and other household material. Infections transfer from these sites inside the human. The housefly is known to serve as a vector to about 100 parasite species. The major diseases transmitted by houseflies are typhoid, cholera, salmonellosis, Dysentery, enteric fever, tuberculosis, anthrax, ophthalmia, etc.
Dengue fever is not transmitted by housefly as its vector is the female Aedes mosquito. Parasitic strains of dengue are found in stagnant water places. These are places where the vector mosquito breeds and lays eggs.

So, option D) is the correct answer.

Note: Houseflies are the most common flies that can be found everywhere in the world and these are major threats as these are vectors for many diseases. In the early 20th century, the Canadian public health workers targeted to eliminate house flies. As these were potential vectors for transmission of tuberculosis.