Question

The disease not transmitted by housefly is
A. Dysentery
B. Cholera
C. Enteric Fever
D. Dengue

Answer 1

Hint: Housefly is a mechanical vector that carries pathogens from one host to another through its body. These pathogens may be fungi, parasites, bacteria or viruses. These pathogens may be responsible for some serious diseases in domestic animals as well as human beings.

Complete answer:
Musca domestica, the synanthropic house fly belongs to the family Muscidae (order Diptera). It is also called the common housefly. They are found in close proximity to the people. They often feed on the food stuffs as well as on the waste produced by human beings thereby transmitting pathogens causing diseases namely, typhoid fever, cholera and shigellosis. The insect transmits these pathogens to the food or other surfaces on landing. It may be through their body hairs or via tarsi.
Dysentery is caused by bacteria Shigella or bacteria Entamoeba histolytica which causes intestinal inflammation. It often goes along with bloody diarrhea. Cholera is caused by bacterium Vibrio cholera which results in loss of water from the body leading to severe diarrhea and dehydration.
Typhoid fever is also referred to as enteric fever. It is a multisystemic illness which is very fatal. It is caused mainly by serotype “typhi” of bacterium Salmonella enterica and, sometimes by serotype “paratyphi” A, B, and C of bacterium Salmonella enterica. Both these serotypes are described by the term enteric fever or typhoid.
On the other hand, dengue is a viral disease transmitted by mosquitoes. Female mosquitoes belonging to the species Aedes aegypti are responsible for transmitting dengue. These mosquitoes also act as vectors for yellow fever, chikungunya and zika virus.

Hence, the correct answer is option (D).

Note: Musca domestica, common house fly is a recognized broad-based pest of home as well as farms. It always remains associated with humans and its activities. It mostly inhabits the poultry and hog farms, ranches and horse stables. Besides being a nuisance, they also carry disease causing pathogens thus imposing severe health issues.