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Journal of Virology
Vaccinia virus strains vary considerably in the amounts of extracellular enveloped virus (EEV) that they release from infected cells. The IHD-J strain produces up to 40 times more EEV than does the related WR strain and consequently generates elongated comet-shaped virus plaques instead of sharply defined round ones in susceptible monolayer cells under liquid medium. The difference in EEV formation is due to the retention of enveloped WR virions on the cell surface (R. Blasco and B. Moss, J.doi:10.1128/jvi.67.6.3319-3325.1993 fatcat:le4cpxxgrvcvjob6qgclcoylla