Antimicrobial resistance of rapidly growing mycobacteria in Western Taiwan: SMART Program 2002

Tsi Shu Huang, Susan Shin Jung Lee, Po Ren Hsueh, Hung Chin Tsai, Yao Shen Chen, Shue Ren Wann, Hsieh Shong Leu, Wen Chien Ko, Jing Jou Yan, Shi Zhi Yuan, Feng Yee Chang, Jang Jih Lu, Jen Hsien Wang, Hua Kung Wang, Yung Ching Liu

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20 Citations (Scopus)

Abstract

Background/purpose: To understand the resistance patterns of rapidly growing mycobacteria (RGM) in Taiwan, antimicrobial resistance of clinical isolates was determined as part of the SMART (Surveillance from Multicenter Antimicrobial Resistance in Taiwan) program. Methods: During the period from January 2002 to December 2003, clinical isolates were collected from eight hospitals located on the west side of Taiwan and one reference laboratory. Broth microdilution minimum inhibitory concentrations of 11 antimicrobial agents were determined for 312 clinical isolates of RGM, including the Mycobacterium fortuitum group (110 isolates), Mycobacterium abscessus group (168 isolates), and Mycobacterium chelonae group (34 isolates). Results: Nearly all of the RGM were susceptible to amikacin and ofloxacin (≥ 90%) and resistant to doxycycline (<3% susceptible). Tobramycin showed similar in vitro activity against the M. fortuitum and M. chelonae (77%) groups, but was less active against the M. abscessus group (58%). Ciprofloxacin was active mainly against M. fortuitum (95%). Nearly all RGM were resistant to erythromycin and doxycycline. However, around half of the RGM isolates remained susceptible to minocycline (50-54%). Clarithromycin was active against the M. abscessus group (53% susceptible), with a high rate of resistance in the M. chelonae (38% susceptible) and M. fortuitum (15% susceptible) group. Cefoxitin was more active against the M. fortuitum group (65%) than the other two RGM (40-44%), and <40% of the RGM isolates remained susceptible to imipenem (21-38%). Conclusion: The resistance of RGM in Taiwan is not as high as previously reported (notably for tobramycin, ciprofloxacin and cefoxitin), but reduction in the susceptibility rates of clarithromycin and imipenem for the M. fortuitum and M. abscessus groups demonstrates the importance of in vitro susceptibility testing of clinically important isolates, as susceptibility may differ in different geographical areas, even regionally, and over time.

Original languageEnglish
Pages (from-to)281-287
Number of pages7
JournalJournal of the Formosan Medical Association = Taiwan yi zhi
Volume107
Issue number4
DOIs
Publication statusPublished - Apr 2008
Externally publishedYes

Keywords

  • Antibiotic resistance
  • Antibiotic susceptibility
  • Non-tuberculous mycobacterium
  • Rapidly growing mycobacteria
  • SMART

ASJC Scopus subject areas

  • Medicine(all)

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