In Vitro Susceptibilities of Mycoplasma hominis to Six Fluoroquinolones as Determined by E Test

Twenty isolates of Mycoplasma hominis were tested for their susceptibility to six fluoroquinolones by the E test. The MICs at which 90% of the isolates were inhibited (in micrograms per milliliter) were as follows: sparfloxacin, 0.031; clinafloxacin, moxifloxacin, and trovafloxacin, 0.063; levofloxacin, 0.25; and ciprofloxacin, 0.5. Increasing the amount of inoculum or incubation in CO(2) elevated MICs by ≤1 dilution. E tests produce fluoroquinolone MICs comparable to those obtained by agar and microbroth dilution for M. hominis.