title: Aztreonam: correlation between disk diffusion and agar plate dilutions susceptibility tests.
abstract: Regression lines and error rate-bounded analyses were performed for correlating inhibitory zone diameters with the 30-micrograms aztreonam disk and aztreonam minimal inhibitory concentration for gram-negative aerobic clinical isolates. A correlation coefficient of -0.81 was found for the regression line. Preliminary proposed criteria to distinguish susceptible isolates from resistant ones are: susceptible greater than or equal to 22 mm (MIC less than or equal to 8 micrograms/ml), intermediate 16-21 mm (MIC = 16 micrograms/ml) and resistant less than or equal to 15 mm (MIC greater than or equal to 32 micrograms/ml). Using these criteria, the rates for false-susceptible and false-resistant isolates were zero.
mesh_terms: D000362:Agar; D001398:Aztreonam / Q000494:pharmacology*; D004352:Drug Resistance, Microbial; D006088:Gram-Negative Aerobic Bacteria / Q000187:drug effects*; D008826:Microbial Sensitivity Tests / Q000379:methods*; D012044:Regression Analysis
chemical_list: D000362:Agar; D001398:Aztreonam