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An in vitro method is described to measure the inhibitory activity of murine peritoneal exudate cells against viral plaque formation by a bovine herpes-virus-infectious bovin'e rhinotracheitis virus. Microtiter plates containing 96 bovine kidney cell monolayers were infected with a range of virus concentration and peritoneal exudate cells were subsequently added. When a sufficient number of cells was added, viral plaques were not detectable and free infectious virus did not occur in the culture fluids. The inhibitory cell type adhered to glass and was presumably a macrohage. Although inhibitory of viral plaques was presumably a macrophage. Although inhibition of viral plaques was complete and free virus could not be detected, virus was not eliminated from the monolayers since on removal of cells, the degree of virus cytopathology and yield of virus after a further 48 h of incubation was the same as in 48-h infected control monolayers. The significance of peritoneal exudate-cells-induced virus suppression as a model to understand herpesvirus latency is briefly discussed.?Author

Defense mechanisms against infectious bovine rhinotracheitis virus: inhibition of virus infection by murine macrophages