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In response to viral infection, unprimed naive CD8(+), major histocompatibility complex class I-restricted, virus-specific T cells clonally expand and differentiate into memory- and effector-type cells. Changes in CD8(+) subset distribution were studied in 17 subjects with acute human immunodeficiency virus type 1 infection and in 14 subjects with acute Epstein-Barr virus (EBV) infection, with combined CD45RO, CD27, and CD28 monoclonal antibodies. A vast expansion of memory-type CD45RO(+)CD27(+)CD8(+) T cells, with high expression of the cell-cycle marker Ki-67, was observed in both infections. Strikingly, CD45RO(+)CD27(+)CD28(-) cells increased &gt;10-fold in acute viral infection and had high Ki-67 expression. In acute EBV infection, a substantial portion of the expanded T cells were EBV-peptide specific. These cells resided mainly in the CD45RO(+)CD27(+) subpopulation, with most in the CD27(+)CD28(-) subpopulation. Content of perforin expression, as a measure of cytotoxic capacity, was relatively low in the CD27(+)CD28(+) T cells and highest in the CD27(-)CD28(-) subpopulation.

the journal of infectious diseases

Changes in the Composition of Circulating CD8<sup>+</sup>T Cell Subsets during Acute Epstein‐Barr and Human Immunodeficiency Virus Infections in Humans

Changes in the Composition of Circulating CD8+T Cell Subsets during Acute Epstein‐Barr and Human Immunodeficiency Virus Infections in Humans

Changes in the Composition of Circulating CD8⁺T Cell Subsets during Acute Epstein‐Barr and Human Immunodeficiency Virus Infections in Humans