Correlation of Netilmicin Disk Diffusion Susceptibility and Agar Dilution Susceptibility

The minimal inhibitory concentration of netilmicin determined by the agar dilution method was correlated with the disk diffusion zone of inhibition against 322 clinical isolates. Regression line analysis revealed good correlation, r = −0.90, and suggested that isolates with zone sizes ≤14 mm should be considered resistant.