Figure 2.

Increased azithromycin susceptibility in a subgroup of P. aeruginosa in RPMI-1640 medium as compared to Mueller-Hinton medium. Azithromycin susceptibility of 55 P. aeruginosa isolates in Mueller-Hinton (a); and RPMI-1640 (b); the medium was measured by disk diffusion and broth microdilution. MIC-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.