During vaccination against tuberculosis (T.B), children are injected with a weakened strain of T.B bacteria. Explain how this procedure can result in long term defence against T.B.
- Weakened strains of T.B induce B-lymphocytes to divide rapidly by mitosis forming a clone of B-cells.
- Some of the B-cells differentiate into memory cells which retain the ability to recognise T.B germs.
- Reinfection by the same T.B bacteria causes the memory cells to divide faster than the bacteria producing antibodies which attack the bacteria and render them harmless
CATEGORIES Bio Questions and answers
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