%0 Journal Article %A Warden, D. %A Thorne, H. V. %T The Infectivity of Polyoma Virus DNA for Mouse Embryo Cells in the Presence of Diethylaminoethyl-dextran %D 1968 %J Journal of General Virology, %V 3 %N 3 %P 371-377 %@ 1465-2099 %R https://doi.org/10.1099/0022-1317-3-3-371 %I Microbiology Society, %X SUMMARY Plaques were produced in mouse-embryo monolayers by infection with polyoma virus DNA in the presence of diethylaminoethyl-dextran. Optimum conditions for plaque assay were established and dose-response relationships for component I and component (II+III) polyoma DNA determined. Efficiencies up to 6 × 105 p.f.u./µg. were obtained for component I DNA. %U https://www.microbiologyresearch.org/content/journal/jgv/10.1099/0022-1317-3-3-371