Q18 of 39 Page 74

Vectors can be defined as

A disease vector is any agent (animal, or microorganism) that carries and spreads diseases. It can be as small as a housefly.

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16

You are aware of Polio Eradication Programme in your city. Children are vaccinated because

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Viruses, which cause hepatitis, are transmitted through

 19

Give two examples for each of the following

(a) Acute diseases


(b) Chronic diseases


(c) Infectious diseases


(d) Non-infectious diseases

 20

Name two diseases caused by Protozoans What are their causal organisms?