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The morphologic and structural findings made with the electron microscope in unshadowed as well as in shadow-cast specimens of treponemas from typical cases of yaws, pinta and the so-called Cuban form of pinta are presented. Thirty Treponema pertenue and nine T. carateum specimens as well as eighty-nine Treponema sp. specimens from a case of the Cuban form of pinta constituted the material studied. No differences in morphology or structure were detected among these species or with regard to T. pallidum, except for the lack of flagella shown by T. pertenue specimens which was probably an artifact. Measurements of length and diameter of treponemas were obtained. Several examples of pseudostructures are shown, some of which have a bearing upon the significance of spore-like bodies and end bodies.
1 Department of Experimental Pathology, University of Havana School of Medicine, Havana, Cuba.
2 The Edsel B. Ford Institute for Medical Research, Henry Ford Hospital Detroit, Michigan.
3 Government Medical Service, Kingston, Jamaica, B.W.I.
4 Commission for the Prophylaxis of Syphilis, Leprosy and Cutaneous Diseases, Havana, Cuba.
5 Institute of Health and Tropical Diseases, Mexico City, Mexico.
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