[Basic evaluation of BACTEC MGIT 960 Series for drug susceptibility testing of antimicrobial agents against
Yukie Furuhata1, Yuji Kikuchi, Yoko Tazawa
1Clinical Laboratory, Kanto Medical Center, NTT EC, 5-9-22 Higashigotanda, Shinagawa-ku, Tokyo 141-8625, Japan. furuhata@kmc.mhc.east.ntt.co.jp
Abstract:
This time, we compared conventional method Well pack P (the proportion method on Ogawa egg medium) with automated instrument BACTEC MGIT 960 AST system for Mycobacterium tuberculosis drug susceptibility testing. Fifty-three M. tuberculosis stock strains were used. Concordance rates between the two methods were SM: 94.3%; INH: 100%; RFP: 100%; and EB: 90.5%. All 23 drug-susceptible strains corresponded to four drugs. Discrepant results were observed in six of 30 drug-resistant strain. The mean times for results from the MGIT 960 AST system was 8.7 days. On the other hand, with Well pack P, growth of drug resistant strains was slow, and it was still difficult to judge four weeks later. Although the MGIT 960 AST system has problems, such as its high cost of labor and reagents, and the confirmation of contamination, because it is an automatic instrument, there are no discrepancies due to different technician techniques. The MGIT 960 AST system was found to be a rapid and excellent method.
