Acquired immunity is characterized by: |
Pathogen specificity and memory Non-specific response and memory Pathogen specificity and low intensity response Non-specific response and high intensity response |
Pathogen specificity and memory |
The correct answer is Option (1) - Pathogen specificity and memory. Acquired immunity refers to the immune response that develops after exposure to a specific pathogen. It is characterized by pathogen specificity, meaning that the immune system recognizes and targets specific pathogens. This specificity is achieved through the activation and proliferation of B-lymphocytes and T-lymphocytes, which are specialized immune cells. In addition to pathogen specificity, acquired immunity also exhibits memory. This means that once the immune system encounters a pathogen, it "remembers" the encounter and mounts a more rapid and robust response upon subsequent exposures to the same pathogen. This secondary or anamnestic response is characterized by a heightened intensity and effectiveness in eliminating the pathogen. The development of pathogen-specific memory is crucial for providing long-lasting protection against recurrent infections. It allows the immune system to respond more efficiently to familiar pathogens, preventing or reducing the severity of subsequent infections.
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