Question

what are pathogens and how do they harm human beings ?

Answer 1

pathogens are those micro-organisms (such as bacterium, viruses, etc.) that can cause diseases. They harm human beings by causing minor to serious or even fatal diseases like influenza, tuberculosis, cholera, AIDS, HIV, and many more.
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Answer 2

Pathogen refer to anything that causes disease. Pathogen can be bacterium, virus,fungi,etc.
Pathogens like bacteria harm humans by releasing toxins, virus feed from our cells thus damaging our immune system,protozoans damage and slow down the functioning of the organs that they affect.