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Varicella zoster virus specific cellular immunity and age. The relationship between human age, level of lymphocyte proliferative response to varicella zoster virus antigen and phytohemagglutinin (PHA), and delayed-type hypersensitivity response to varicella zoster virus antigen skin challenge. There is a marked attenuation of varicella zoster-specific cellular immunity in persons over the age of 60 years. Reprinted from Burke et al. (13).

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