Question

What is infectious agent

Answer 1

An infectious agent is something that infiltrates another living thing, like we. When an infectious agent hitches a ride, we have officially become an infected host.

There are four main classes of infectious agents: bacteria, viruses, fungi, and parasites.

Answer 2

ANSWER
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An Infectious agent is something which transmits infection (of something) from one person to another.

An Infectious agent of disease in biological terms is called " Vector"

For example,
A female Anopheles Mosquito is an infectious agent (vector) of Malaria.

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