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(A) Transmission electron micrograph of ehrlichial organisms (arrows) in cytoplasmic vacuoles of mouse macrophage culture. Bar, 1 μm. (B) Transmission electron micrograph, at a higher magnification, showing ultrastructure of the culture-derived causative agent of equine monocytic ehrlichiosis. Single organisms are surrounded by a distinct cytoplasmic vacuolar membrane. Note the rippled outer membrane of the organism. Bar, 0.2 μm.
