Answer :
Final answer:
The statement is true. When the body encounters a previously encountered pathogen, the immune system response is based on immunological memory, allowing it to quickly and efficiently fight off the infection. This principle is also the basis for vaccinations.
Explanation:
True. When re-exposure to a pathogen identical to one that has been previously encountered occurs, the body responds based on the principle of immunological memory. This means the immune system has a 'memory' of that pathogen and can thus respond more swiftly and effectively to it. This is often why symptoms of a repeated infection may be less severe or even unnoticed.
Upon this re-exposure, a secondary adaptive immune response is generated, which is typically faster and stronger than the primary response. This response often eliminates the pathogen before significant symptoms develop. This secondary response's speed and efficiency reflect the immune system's ability to recognize and remember certain pathogens as a result of past exposures.
The concept of immunological memory is also the basis for vaccination. Vaccines expose the body to a benign form of a pathogen, prompting the immune system to mount a defensive response. This response includes creating a 'memory' of the pathogen, enabling your body to fight off future infections swiftly and effectively.
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