Examlex
If a good is characterized by easy exclusion but many may concurrently use it without reducing the amount available for others, the good is a:
Primary Immune Response
The initial reaction of the immune system when exposed to an antigen for the first time.
Memory Cells
A type of white blood cell that retains a memory of previously encountered pathogens and mounts a stronger and faster response upon reexposure.
Antigen
A substance that when introduced into the body, prompts the generation of an immune response by the production of antibodies.
Secondary Immune Response
The body's immune system's more rapid and intensified response to a pathogen it recognizes from a previous infection.
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