Question

what are pathogen infection

Answer 1

The first link in the chain of infection is the pathogen. A pathogen is anything that causes a disease. Bacterium A group of microscopic organisms that are capable of reproducing on their own, causing human disease by direct invasion of body tissues.

Answer 2

Here's your answer:-
In biology, a pathogen (Greek: πάθος pathos "suffering, passion" and -γενής -genēs "producer of") in the oldest and broadest sense is anything that can produce disease; the term came into use in the 1880s.[1][2] Typically the term is used to describe an infectious agent such as a virus, bacterium, protozoa, prion, a fungus, or other micro-organism.[3


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