IMMUNIZATION OF RABBITS TO INFECTIOUS PAPILLOMATOSIS.
Two intraperitoneal injections of either infectious or non-infectious rabbit papilloma suspensions actively immunize rabbits against papillomatosis. The capacity of the non-infectious suspensions to immunize is considered as evidence that they contain papilloma virus even though none can be demonstrated by the usual infection test.
Shope
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Department of Animal and Plant Pathology of The Rockefeller Institute for Medical Research, Princeton, N. J.