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Ultrastructure of Rickettsia felis (Louisiana State University [LSU]) in cat flea salivary glands. Scale bar = 1 μm. (A) Rickettsiae free in the cytosol (arrows) of several epithelial cells. Microvilli (MV) extending into the lumen (L) of the salivary gland. (B) Rickettsiae are clustered in a basal part of a cell close to the basal lamina (BL) in an epithelial cell from a different flea. Arrowheads indicate small vacuoles in the rickettsial cytoplasm.
