Natural immunity.
Active Immunity
Active Immunity
exposure to antigen
Active immunity requires exposure to the antigen, either naturally or artificially, in order for the immune system to build antibodies against it. Passive immunity does not require exposure to the antigen because the antibodies are obtained either naturally, through mother's milk, or artificially through an injection of a serum, such as that is used in antivenom for snake bites.
1. mother to fetus2. Through exposure to the antigen(virus, toxins,or cancer cells).
antigen
If a person's immune system is producing antibodies against a specific antigen, then that person has a positive or active immunity toward that antigen. If a person has merely been injected with antibodies but does not produce them, that is a passive immunity.
the immunity that results from the production of antibodies by the immune system in response to the presence of an antigen.
The answer is sentizitation
the immunity that results from the production of antibodies by the immune system in response to the presence of an antigen.
Immunity independent of antibody but dependent on the recognition of antigen by T cells and their subsequent destruction of cells bearing the antigen or on the secretion by T cells of lymphokines that enhance the ability of phagocytes to eliminate the antigen.
Antigen
1) it is specific, 2) systemic, 3) and it has memory