Question

What do we mean by pathogen?

Answer 1

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Any microorganisms which cause diseases in animals or plants is called pathogens.
Some common pathogens are -Salmonella Typhi (causes Typhoid), Vibio Cholerae (Causes Cholera) etc.
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Answer 2

The organisms which can affect humans or can cause various diseases in the body of humans like viruses, bacteria, etc, are termed as pathogens.

For example :

1. Pathogen named HIV causes a serious disease called AIDS.

2. Bacterial pathogen named Salmonella typhi is responsible for causing typhoid.

3. Pathogenic protozoan named Plasmodium causes a drastic disease called malaria.