Natural active immunity

Definition

Natural active immunity is the immunity that results from the body's natural response to an infection by producing specific antibodies and memory cells. It provides long-term protection because the immune system remembers the pathogen upon future exposures.

5 Must Know Facts For Your Next Test

1. The primary mechanism involves the activation of T-cells and B-cells in response to pathogens.
2. It leads to immunological memory, allowing for a faster and stronger response upon subsequent exposures to the same pathogen.
3. Natural active immunity can be lifelong for some diseases, such as measles or chickenpox.
4. It differs from artificial active immunity, which is acquired through vaccination.
5. The effectiveness of natural active immunity depends on the individual's overall health and immune system functionality.

Related terms

T-cells: A type of lymphocyte that plays a central role in cell-mediated immunity.

B-cells: A type of lymphocyte responsible for producing antibodies as part of the humoral immune response.

Immunological Memory:

The ability of the immune system to remember past encounters with pathogens and respond more rapidly and effectively on subsequent exposures.