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Old people have weak immune systems What could be the reason

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The thymus gland in the body does the job of secreting the hormone called thymosin which plays a big role in the differentiation of T-lymphocytes. T-lymphocytes are responsible for cell mediation for immune response. In old people, because of their age, their thymus gland starts to degenerate, which results in reduced production of thymosin. Thus, old people have weak immune systems.

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