Proposed quality control guidelines for National Committee for Clinical Laboratory Standards Susceptibility Tests using the veterinary antimicrobial agent tiamulin

Diagn Microbiol Infect Dis. May-Jun 2001;40(1-2):67-70. doi: 10.1016/s0732-8893(01)00239-5.


Quality control guidelines for standardized antimicrobial susceptibility test methods are critical for the continuing accuracy of these clinical tests. In this report, quality control limits were proposed for the veterinary antimicrobial agent tiamulin with minimum inhibitory concentration (MIC) ranges of three or four log(2) dilution steps in two different medium formulations. Disk diffusion zone diameter ranges were proposed for tiamulin tested against Actinobacillus pleuropneumoniae ATCC 27090 (12-18 mm) and Staphylococcus aureus ATCC 25923 (25-32 mm). The data from eight participating laboratories produced 100% of results within proposed MIC limits (8-32 microg/mL), and 95.8-97.0% of zones were found within suggested zone diameter QC guidelines. These proposed QC ranges should be validated by in-use results from veterinary clinical laboratories.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Actinobacillus Infections / microbiology
  • Actinobacillus Infections / veterinary
  • Actinobacillus pleuropneumoniae / drug effects*
  • Animals
  • Anti-Bacterial Agents / pharmacology*
  • Diterpenes / pharmacology*
  • Laboratories / standards*
  • Microbial Sensitivity Tests / methods
  • Microbial Sensitivity Tests / standards
  • Quality Control
  • Reference Standards
  • Staphylococcal Infections / microbiology
  • Staphylococcal Infections / veterinary
  • Staphylococcus aureus / drug effects*
  • Swine
  • Swine Diseases / microbiology*


  • Anti-Bacterial Agents
  • Diterpenes
  • tiamulin