Peritoneal Macrophage A Iterations Caused by Naturally Occurring Mouse Hepatitis Virus

During routine harvest of murine resident peritoneal cells for macrophage function assays the authors recently noted that mice showed a 3-4-fold spontaneous increase in number of peritoneal cells within 1 week of being placed in one of their animal rooms. While the mice appeared clinically normal, the collected macrophages had highly convoluted membranes, showed en- hanced spontaneous tumor cell killing, and showed increased erythrophagocytosis. Histopathologic findings included mild peritonitis and occasional foci of individual hepatocyte necrosis. The results of routine murine serologic studies and bacterial cultures of the peritoneal cavity were negative. Immunosuppressed mice placed

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