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Am. J. Trop. Med. Hyg., 43(4), 1990, pp. 400-409
Copyright © 1990 by The American Society of Tropical Medicine and Hygiene

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Infection of colonized cat fleas, Ctenocephalides Felis (Bouché), with a Rickettsia-like Microorganism

J. R. Adams, E. T. Schmidtmann AND A. F. Azad
U. S. Department of Agriculture, Agricultural Research Service, Beltsville, Maryland; University of Maryland School of Medicine, Baltimore, Maryland

We report the ultrastructure of a rickettsia-like microorganism in a colonized population of the cat flea Ctenocephalides felis (Bouché). The microorganism occurs principally in the cytoplasm of midgut cells, but similar microorganisms were detected in the tracheal matrix, muscle, hypodermis, ovaries, and the epithelial sheath of the testes. The microorganism has a well-defined cell membrane consistent with rickettsia and measures 0.25–0.45 µm in diameter with lengths up to 1.5 µm. It was observed repeatedly in fleas of 1 laboratory colony, including newly emerged non-bloodfed specimens, but not in specimens from several other sources.




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Copyright © 1990 by the American Society of Tropical Medicine and Hygiene.