Journal of Capital Medical University ›› 2021, Vol. 42 ›› Issue (4): 623-628.doi: 10.3969/j.issn.1006-7795.2021.04.018

• Clinical Research • Previous Articles     Next Articles

In vitro antibacterial activities of tigecycline in combination with 5 antimicrobial agents for Stenotrophomonas maltophilia determined by broth microdilution method and chequerboard

Wei Jingjuan, Ma Liyan, Su Jianrong*   

  1. Center of Clinical Laboratory, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
  • Received:2020-10-22 Online:2021-08-21 Published:2021-07-29
  • Contact: * E-mail:youyilab@163.com
  • Supported by:
    Jieping Wu Medical Foundation of Beijing Municipal Science & Technology Commission (Z141107006614005).

Abstract: Objective To investigate the In vitro antibacterial activities of tigecycline combined with levofloxacin, sulfamethoxazole-trimethoprim(SXT), minocycline, ceftazidime, cefperazone-sulbactam for Stenotrophomonas maltophilia (SMA) isolates resistant to levofloxacin. Methods Totally 33 SMA isolates resistant to levofloxacin were cultured from patients with bacteremia and tissue infection and collected from Beijing Friendship Hospital, Capital Medical University. All SMA isolates were divided into 3 groups: levofloxacin resistant isolates(n=17); levofloxacin resistant, SXT resistant isolates(n=11);levofloxacin resistant, SXT resistant, minocycline resistant isolates(n=5). The susceptibility of 6 agents against these SMA were tested by broth microdilution method. Tigecycline combined with levofloxacin, sulfamethoxazole-trimethoprim(SXT), minocycline, ceftazidime, cefperazone-sulbactam against these isolates were performed by chequerboard dilution. The fractional inhibitory concentration (FIC) index was calculated to evaluate the efficiency of these combination. Results Susceptibilities of tigecycline to levofloxacin resistant SMA and levofloxacin resistant, SXT resistant SMA were 76.4% and 54.5%, respectively, and it's a bit lower than susceptibilities of minocycline. According to the results of chequerboard, the combination of tigecycline with levofloxacin, ceftazidime, cefperazone-sulbactam showed synergy against some SMA isolates. None of the combinations showed antagonistic activity. Conclusions Tigecycline combined with levofloxacin, ceftazidime or cefperazone-sulbactam may be a choice for treating SMA infection in clinical practice.

Key words: tigecycline, Stenotrophomonas maltophilia, broth microdilution method, chequerboard dilution

CLC Number: