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Comparison of disc diffusion and minimum inhibitory concentration (MIC) results of Australian isolates of Histophilus somni for (a) tetracycline, (b) tilmicosin and (c) tulathromycin. Solid line, resistant breakpoint; broken line, susceptible breakpoint. Isolates with a MIC value less than the lowest concentration tested have been given the value of the lowest concentration tested. Disc diffusion breakpoints for tetracycline are not available. Overlapping of data occurs at some points.
