Spontaneous Kidney Tumors in the Frog: Rate of Occurrence in Isolated Adults

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Science  23 Aug 1963:
Vol. 141, Issue 3582, pp. 720-721
DOI: 10.1126/science.141.3582.720


Kidney tumors in the frog are thought to be virus-caused and naturally transmitted. The present report indicates that natural transmission between mature adults is not a factor in spontaneous tumor development and implies primary infection at earlier stages if a virus is indeed involved. Parasitism and nutritional state appear to be of little significance.