Question

Which of the following is not a viral disease?
a. Measles
b. Rabies
c. Polio
d. Tuberculosis

Answer 1

The disease from the above options which is not caused by a virus is caused by a small, aerobic and nonmotile bacillus. This infectious disease usually affects the lungs, but it can also affect other parts of the body. The disease is spread through the air from one person to another when a person with active disease in the lungs coughs, spits, talks, or sneezes.

Complete answer:
Let's study about each option one by one

Option A:
Measles is an extremely infectious disease. It is caused by the Rubella Virus of the Paramyxovirus family. It is an airborne disease. It is easily transmitted through small droplets which are released when an infected person coughs or sneezes. The Virus first infects the respiratory tract and then eventually spreads to other parts of the body through blood. Thus, option A is incorrect.

Option B:
Rabies is a disease caused by the Rabies virus of the Rhabdovirus Family. When an infected animal bites or scratches a man or other animal, the virus is transmitted. The virus can also spread through the saliva of the infected animal. Without medical supervision the disease is likely to cause death. Therefore it is always advised to seek medical help immediately after being bitten by any animal. Thus, option B is incorrect.

Option C:
The Polio Virus causes polio or poliomyelitis. Poliovirus is normally transmitted through human faecal matter that is infected. It may also spread through food and water contaminated with human faeces. Through infected saliva, it is less commonly spread. The virus affects the nervous system mainly. Thus, option C is incorrect.

Option D: Tuberculosis is a contagious disease that mainly affects the lungs. A type of bacterium called Mycobacterium tuberculosis causes tuberculosis. The bacteria is transmitted from one person to another through tiny droplets released in the air when the affected person coughs or sneezes. The bacteria most likely affects lungs first and then it spreads to other parts of the body by blood.
Hence, the correct answer is option (D).

Note: The main risk of contracting tuberculosis is breathing polluted air that contains disease-causing microbes. Tuberculosis microbes can be present in the air in sufficient concentrations to cause infection and disease. In the air, water evaporates from the surface of the particles, reducing their size and concentrating their microbial content.