The level of immunological vigor peaks at adolescence, starts to decline after 3rd decade, showing 50% level of the peak at 5th decade and occasionally 10% level of the peak at 8th decade. In association with the decline of immunological vigor, occurrence of cancer and infection increases with advance of age. It is important to note that individual variation is very broad. Accordingly, it is important to assess the immunological vigor of individual people in order to manage healthy level and control diseased condition.
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