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Modified vaccinia Ankara (MVA) is a highly attenuated vaccine vector that has an excellent vaccine safety record. Also, as a eukaryotic gene expression vector, MVA can be used in a biosafety level 1 setup, in contrast to more virulent vaccinia virus strains. Isolation of recombinant MVA involves repeated plaquing of the virus and is burdensome because virus plaques are slow to develop and difficult to recognize. To facilitate the generation of MVA recombinants, we have developed a cloning system for MVA based on the selection of the viral F13L gene. Deletion of F13L in MVA produced a small plaque phenotype and a reduction in extracellular virus formation, indicating a severe block in cell-to-cell spread. When using the F13L knockout virus as the parental virus, reintroduction of the F13L gene in the original locus was used as an efficient selection for the isolation of virus recombinants. The selection procedure can be done entirely in the permissive baby hamster kidney (BHK)-21 cell line, does not require plaque isolation, and rendered close to 100% recombinant virus.

Isolation of vaccinia MVA recombinants using the viral F13L gene as the selective marker