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The results of this study to dissect the nature of the acquired immune response to infection withListeria monocytogenes in mice with targetted gene disruptions show that successful resolution of disease requires the essential presence of αβ T cells and the capacity to elaborate gamma interferon. In the absence of either of these entities, mice experience increasingly severe hepatitis and tissue necrosis and die within a few days. The data from this study support the hypothesis that the protective process is the efficient replacement of neutrophils in lesions by longer-lived mononuclear phagocytes; αβ-T-cell-knockout mice died from progressive infection before neutrophil replacement could occur, whereas in γδ-T-cell-knockout mice this replacement process in the liver has previously been shown to be much slower. In the present study we attribute this delay to reduced production of the macrophage-attracting chemokine MCP-1 in the γδ-T-cell-knockout animals. These data further support the hypothesis that γδ T cells are important in controlling the inflammatory process rather than being essential to the expression of protection.

Disruption of the Cellular Inflammatory Response toListeria monocytogenesInfection in Mice with Disruptions in Targeted Genes