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. 2020 Apr 29;9(5):218. doi: 10.3390/antibiotics9050218

Figure 1.

Figure 1

Increased azithromycin susceptibility of Enterobacteriaceae in RPMI-1640 medium as compared to Mueller-Hinton medium. Azithromycin susceptibility of 28 E. coli, 24 E. cloacae and 26 K. pneumoniae isolates in Mueller-Hinton (a); and RPMI-1640 (b); the medium was measured by disk diffusion and broth microdilution. A MIC-colored zone method was applied to correlate the inhibition zone diameter (mm) of each bacterial isolate with the corresponding MIC (mg/L). Kendall’s τ and p-value were calculated for each species and medium. Each isolate was tested in two independent experiments. Disk size: 6 mm, 15 µg azithromycin.