Comparative MPCs of veterinary FQs for E. coli ATCC 8739 and S. aureus ATCC 6538. Graphs represent total CFU (geometric means ± standard deviation) and comprise as references the lower parts of the respective graphs shown for PRA in Fig. 2. FQs analyzed included PRA (•), ENR (▪), MAR (▵), DAN (⋄), SAR (▿), ORB (⧫), and DIF (○). Inocula were in the order of 4 × 109 CFU per plate, and incubation times are given in Fig. 2.