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The protective antigen is the antigen an antibody binds to killing the pathogen. It more or less is the "kill spot" for the pathogen. Also known as protective epitope.
A disease producing organism is a pathogen. An invasion of the body by a pathogen is an infection. Although an infection is a generalized name for the body's response to any invasion by any pathogen.
bacterium
INFECTION
opportunistic infection
dont no
Infection
The pathogen tries to infect the body. The defense mechanism of the body resists the entry of the pathogen. If pathogen succeeds the infection is established and the body becomes sick.
Infection
A treatable pathogen that causes infection
infection
A pathogen.