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Danofloxacin is a fluoroquinolone antibacterial agent approved for use in veterinary medicine to treat and control bovine respiratory disease caused by Mannheimia haemolytica or Pasteurella multocida. Susceptible minimal inhibitory concentration (MIC) breakpoint (≤0.25 µg/mL) and disk diffusion interpretive criteria (≥22 mm) values for danofloxacin against M. haemolytica and P. multocida were first approved by the Clinical and Laboratory Standards Institute (CLSI) in 2003. However, intermediate and resistant breakpoint values were not established because only susceptible wild-type populations were evident at the time of breakpoint approvals. Since then, nonsusceptible isolates of M. haemolytica and P. multocida have been identified. We report danofloxacin intermediate MIC breakpoint (0.5 µg/mL) and disk diffusion interpretive criteria (18–21 mm), as well as danofloxacin-resistant MIC breakpoint (≥1 µg/mL) and disk diffusion interpretive criteria (≤17 mm), based on scattergram plots of MIC values versus disk zone diameters and calculated error-bound rates using M. haemolytica and P. multocida isolates recovered from bovine respiratory disease in North America in 2004–2014. These newly established intermediate and resistant clinical breakpoint values have been endorsed by CLSI and can be used for interpreting results from antibacterial susceptibility testing of danofloxacin against M. haemolytica and P. multocida isolated from bovine respiratory disease.

journal of veterinary diagnostic investigation

New interpretive criteria for danofloxacin antibacterial susceptibility testing against <i>Mannheimia haemolytica</i> and <i>Pasteurella multocida</i> associated with bovine respiratory disease

New interpretive criteria for danofloxacin antibacterial susceptibility testing against Mannheimia haemolytica and Pasteurella multocida associated with bovine respiratory disease