Immunostimulation of Cytomegalovirus-Transformed Cells and Its Inhibition by Blocking Sera 2

Abstract
Spleen cells cytotoxic at high effector cell: target cell ratios specifically enhanced target cell survival at low ratios. Both cytotoxicity and immunostimulation could be specifically blocked by sera from tumor-bearing or virus-sensitized hosts. The results suggested that serum factors participate in the regulation of the cell-mediated immune response.

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