title: Comparison of direct and standardized disk diffusion susceptibility testing of urine cultures.
abstract: A comparison between direct and standardized disk diffusion tests was made on a total of 300 urine specimens containing >/=10(5) organisms/ml. Of these, 246 represented pure cultures and 54 represented mixed cultures. The number of major discrepancies per organism tested in pure culture was 18 (7.3%) and in mixed cultures it was 23 (42.6%). The percentage of major discrepancies per total number of antimicrobial drug comparisons made was 1.4%. Although this procedure may be of value in selected cases with pure cultures of organisms present in quantities >/=10(5)/ml, its use on a routine basis is not recommended.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D008722:Methods; D008826:Microbial Sensitivity Tests / Q000295:instrumentation*; D014556:Urine / Q000382:microbiology*
chemical_list: D000900:Anti-Bacterial Agents