Fusion-defective mutants of mouse hepatitis virus A59 contain a mutation in the spike protein cleavage signal.

Abstract excerpt

Infection of primary mouse glial cell cultures with mouse hepatitis virus strain A59 results in a productive, persistent infection, but without any obvious cytopathic effect. Mutant viruses isolated from infected glial cultures 16 to 18 weeks postinfection replicate with kinetics similar to those of wild-type virus but produce small plaques on fibroblasts and cause only minimal levels of cell-to-cell fusion under...

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