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Morphological changes of monocytes incubated with C. burnetii. THP-1 cells were incubated with C. burnetii for 5 min. After fixation and dehydration, about 100 cells were examined with a scanning electron microscope and representative cells were photographed. (A) Control monocyte. (B) Monocyte incubated with virulent bacteria. (C) Monocyte incubated with avirulent variants of C. burnetii.
