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Transmission electron micrographs of J774 cells infected with B. henselae. (A) Initial contact of bartonellae with the macrophage surface. Long microvilli (arrowheads) are in close association with the invading bacteria (arrows). Scale bar, 0.4 μm. (B) Macrophage containing intracellular bacteria (arrows) within membrane-bound vacuoles 2 h postinfection. Scale bar, 0.3 μm.
