Acquired Immunity: Memory and Response — NEET Biology
📚 Practice ConceptAcquired immunity, on the other hand is pathogen specific. It is characterised by memory. This means when our body encounters a pathogen for the first time it produces a response called primary response which is of low intensity. Subsequent encounter with the same pathogen elicits a highly intensified secondary or anamnestic response. This is ascribed to the fact that our body appears to have memory of the first encounter.
Which of the following statements regarding immune responses and vaccination are NOT correct? S1: Vaccination works by inducing a low-intensity primary immune response and subsequent memory cell formation. S2: The primary immune response is generally characterized by a slower onset and lower antibody production compared to a secondary response. S3: The secondary immune response is slower but more prolonged than the primary response due to the rapid proliferation of memory cells. S4: Memory B and T-cells, once formed, enable the body to elicit a highly intensified anamnestic response upon re-exposure to the same pathogen. S5: Passive immunisation, such as antitoxin injection, directly stimulates the production of memory cells against specific toxins for long-term protection.
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