The cytolytic T lymphocyte response to the murine cytomegalovirus. II. Detection of virus replication stage‐specific antigens by separate populations of in vivo active cytolytic T lymphocyte precursors

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Abstract
During the acute cytolytic T lymphocyte (CTL) response of mice to infection with the murine cytomegalovirus 2 independent populations of activated interleukin-receptive CTL precursors can be demonstrated. One population is specific for cell membrane-incorporated viral structural antigens; the second population detects an antigen, whose appearance is correlated with the synthesis of viral immediate early proteins. Since this new type of antigen is only defined by lymphocyte recognition, it is referred to as the lymphocyte-detected immediate early antigen (LYDIEA). Expression of immediate early antigen precedes the production of viral progeny and, therefore, it is possible that LYDIEA-specific CTL could serve as indicator cells for the very first activities of the viral genome, even during nonproductive infection.