Answer:During a second infection, the immune system activates B helper and T helper cells that were created during the first exposure.
Therefore, B helper and T helper cells are activated which are created during first exposure.
Explanation:
What are B helper and T helper cells?
Helper T-cells are one of the most important factor of adaptive immunity.They play a specific role in in almost all adaptive immune responses.
Helper T-cells activate B-cells and the function of B- cell is to produce antibodies which help to fight from various infectious diseases.
The site for the production of T cell is bone marrow and matures in the thymus.T cells generates from stem cells.
Therefore,T helper and B helper cells are developed during first exposure and gets activated during a second infection.
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