Memory Lymphocytes and Immunisation

Question 1

Memory Lymphocytes & Immunity

Answer 1

When a pathogen infects the body for the first time, the immune response is slow, allowing symptoms to develop. Over time, B-lymphocytes produce the necessary antibodies to fight off the infection. After recovery, memory lymphocytes remain in the body, ready to respond quickly if the same pathogen appears again, often preventing symptoms entirely.

Question 2

Immunisation:

Answer 2

Vaccines contain dead or inactive pathogens with antigens that trigger an immune response. This leads to antibody production and memory lymphocyte formation, ensuring the immune system is prepared for future infections. If live pathogens of the same type enter the body later, the immune response is faster and stronger, making illness less likely.