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Two species of squirrels were inoculated intravenously and intradermally with cultures of B. bacilliformis. This organism was recovered in cultures of the blood and of the skin at the sites of inoculation up to the tenth day in the case of the grey squirrel, Sciurus carolinensis, but only up to 48 hours with the gopher, Citellus tridecemlineatus. Skin cultures from other than the sites of inoculation were negative. No verruga nodules were produced in either rodent.
1 These studies were carried out in 19491950 in the Division of Entomology and Economic Zoology of the University of Minnesota, under a fellowship from the John Simon Guggenheim Memorial Foundation. The author desires to express his warmest thanks to Dr. Clarence E. Mickel, Chief of the Division of Entomology and Economic Zoology, for the many facilities which were placed at his disposal; to Dr. G. B. Fairchild, Professor of Medical Entomology, under whose immediate direction this work was carried out; and to Dr. Marshall Hertig, Gorgas Memorial Laboratory, Panama, for many valuable suggestions and criticisms on various occasions.
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