Name some diseases that spread through air. Explain how they spread.


Common cold, pneumonias and tuberculosis can spread through air. These are infectious diseases and spread by the means of little aerosol droplets thrown out by an infected person during sneezing or coughing. The microbes in these droplets enter a healthy person and infects them. 

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Which of the following physical contact can spread AIDS?

handshake, hugs, wrestling.


None of the physical activities like handshake, hugs or wrestling can spread AIDS. 

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What is vectors?


The organisms that carry the infectious agents from a sick person to a potential host or healthy person are called vector. These organisms are responsible for the spread of the diseases. 

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How does diseases spread through water?


Drinking water which is polluted with the disease causing microbes causes diseases. When the excreta of an infected person gets mixed with the drinking water. The infectious microbes present in the water enter the new hosts with drinking watera nd cause the infection. This is how the diseases spread through water.

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Match the following :

Column A

Column B

(i) Tuberculosis

liver

(ii) Jaundice

gut lining

(iii) Typhoid

lungs.


Column A Column B
(i) Tuberculosis  Lungs
(ii)Jaundice  Liver
(iii)Typhoid  Gut lining. 



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