hypersensitivity
allergic reaction
A Hypersensitivity reaction occurs.
Allergy
pathogenesis
an antigen
An antigen is a substance that can invoke an immune response. While an antibody is the immune system's response to an antigen. Antibodies, act by directly neutralizing the antigen and/or bind to the antigen and signaling marcophages to phagocytose the antigen.
No. Immune response is triggered by the antigen.
antigen
Antigen
An antigen is a foreign body. It is used as a "template" to begin an appropriate immune response.
the secondary immune response is faster and stronger than the first. the primary response also takes a few days to react with the antigen whereas the secondary immune response reacts faster to an antigen.
To help immune cells identify and destroy a pathogen
antigen
by producing an immune response