Abstract
Summary
The S E polyoma virus derived originally from strain AKR mice can be passed repeatedly from tissue culture to tissue culture. It is relatively stable when stored at −70°C, −20°C or 4°C for 404 to 169 days and it resists the action of ether, glycerol or trypsin. Heating to 80°C destroys or inhibits its tumor inducing property and this property is impaired by heating at 60°C for 60 minutes or 70°C for 30 minutes. It withstands lyo-philization as indicated by induction of multiple tumors in hamsters 1 to 3 days of age with reconstituted lyophilized virus or with the fluids of cultures infected with reconstituted dried virus.
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