Cover photograph (Copyright © 2006, American Society for Microbiology. All Rights Reserved.): A flea-associated spotted fever group rickettsia, Rickettsia felis (strain LSU), was isolated from cat fleas and cultivated in the tick (Ixodes scapularis)-derived cell line ISE6. Shown is a transmission electron microscopic image of cytoplasmic clearance around electron-dense rickettsiae grouped together in a heavily infected ISE6 cell. Bar, 2.0 |gmm. Photo by Olga Borkhsenious, Louisiana State University School of Veterinary Medicine Microscopy Center. (See related article on page 5589.)
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