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RMSF 5 *
This micrograph reveals the presence of intracellular Rocky Mountain spotted fever bacteria, Rickettsia rickettsii. Spotted fever group rickettsiae can grow in the nucleus or in the cytoplasm of the host cell. Once inside the host the rickettsiae multiply, resulting in damage and death of these cells.
Picture & text from CDC/PHIL. For more information see Rocky Mountain Spotted Fever Pictures from CDC