Question

How the diseases are transmitted from one person to the other person?

Answer 1

Communicable Diseases are those that spread from one person to another. Diseases spread through contaminated air, water, food or vectors (insects and other animals) are called as Communicable diseases.

1. Communicable diseases are caused by disease-causing microbes such as bacteria, viruses, etc.
2. These microbes are found in contaminated food, water, air, etc.
3. Some of them, like the malarial parasite, complete their life cycle in the body of a mosquito.
4. Thus air food and water, sweat act as modes of transmitting these microbes from an infected person to a healthy person.
5. E.g., The cycle given below shows how food and water-borne diseases are transmitted.

Sr. no.	Mode of Transmission	Examples
1.	Contaminated food and water	Cholera, Typhoid
2.	Contaminated air	Tuberculosis
3.	Insect/Animal borne diseases	Malaria, Rabies