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What are the modes of Transmission of Diseases? 9 Class Science

modes of transmission of diseases 9 Class Science

What are the modes of Transmission of Diseases? 9 Class Science

In this article, we will discuss the topic ‘Modes of Transmission of Diseases‘, from the Chapter 5 – Why do we fall ill out for Class 9 Science.

Modes of Transmission of Diseases

The diseases that spread from an infected person to a healthy or disease-free person are called communicable diseases.

These diseases spread when an infected person sneezes or coughs, they throw tiny droplets of water into the air that contains the microbes of the infection.

modes of transmission of diseases 9 Class Science

A healthy person standing nearby when inhaling the air they take in the infected air and may fall sick.

Some example of communicable diseases is chicken pox, tuberculosis, Pneumonia, etc.

These diseases also spread when the excreta of an infected person somehow gets mixed with drinking water used by other people to drink.

Diseases like cholera, typhoid spreads through this means and cause the disease to a new host.

Communicable diseases also spread through sexual intercourse between an infected person and a healthy person.

Therefore, diseases like Acquired Immune Deficiency Syndrome (HIV/AIDS), syphilis are sexually transmitted diseases (STDs).

Acquired Immune Deficiency Syndrome (HIV/AIDS) can also spread through other means like blood-to-blood contact with an infected person by using same syringes in hospitals, or be using same personal belongings (for example, razor, toothbrush, etc.).

modes of transmission of diseases 9 Class Science

 

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Acquired immune deficiency syndrome (HIV/AIDS) can also spread to a healthy baby from their mother during pregnancy or by breastfeeding.

Some diseases like skin infections, ringworm, conjunctivitis are spread by direct contact with an infected person through handshakes, touch or kiss.

Many diseases are carried from an infected person to a healthy person through animals. Such animals are called vectors.

Mosquitoes and houseflies are good examples of such vectors.

The female Anopheles mosquito spreads Malaria whereas Female Aedes mosquito spreads Dengue.

Houseflies sit on garbage, drains, human and animal excreta and then flies off and sit on uncovered food consumed by a healthy person. This way houseflies transmits the disease to the new healthy host.

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