The cell type that remains after an adaptive immune response and is responsible for maintaining the steady-state level of pathogen-specific antibody in circulation is long-lived plasma cells.
Adaptive immunity is a kind of immunity that is made against infectious diseases.
This type of immunity produces a strong response against pathogens and hence is pathogen-specific. The plasma cells that are longed lived produce antibodies as well as memory cells against the specific microbes.
These plasma cells are longed lived so that they can recognize the specific pathogen whenever it invades the body.
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