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. Author manuscript; available in PMC: 2015 Mar 6.
Published in final edited form as: J Dairy Sci. 2014 Oct 11;97(12):7644–7654. doi: 10.3168/jds.2014-8521

Figure 1.

Figure 1

Zone diameter histogram with susceptibility classification of Escherichia coli according to Clinical and Laboratory Standards Institute clinical breakpoints. Reconstructed ideal population of susceptible strains shown as a line graph of normalized resistance interpretation (NRI) with a mean of 27.6 for ceftiofur and 31.7 for ceftriaxone. The 2.5 deviation limit below the NRI mean is marked with a vertical arrow (23 for ceftiofur and 26.5 for ceftriaxone) and the isolates below this limit can be considered nonsusceptible for comparative purposes.