Question

What are pathogens? Mention its harmful effect?

Answer 1

A pathogen is defined as an organism causing disease to its host, with the severity of the disease symptoms referred to as virulence.

Pathogens are microorganisms - such as bacteria and viruses - that cause disease. Bacteria release toxins, and viruses damage our cells. White blood cells can ingest and destroy pathogens. They can produce antibodies to destroy pathogens, and antitoxins to neutralise toxins.