The in vitro susceptibility to linezolid shown by nine Greek isolates of Coxiella burnetii derived from patients with acute Q fever was investigated. MICs of linezolid were compared with those of pefloxacin, ciprofloxacin, ofloxacin, trovafloxacin, doxycycline, and clarithromycin using the shell vial assay. MICs of linezolid and clarithromycin ranged from 2 to 4 μg/ml; those of doxycycline, trovafloxacin, and ofloxacin ranged from 1 to 2 μg/ml; those of pefloxacin ranged from 1 to 4 μg/ml; and those of ciprofloxacin ranged from 4 to 8 μg/ml. Linezolid was effective in controlling intracellular parasites in cultures of Vero cells infected by C. burnetii. No bactericidal activity by linezolid was obtained against C. burnetii at 8 μg/ml
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