This study evaluated the susceptibility of 222 Taiwanese Riemerella anatipestifer isolated from domestic waterfowl between 1999 and 2009 to 22 antimicrobials by agar disk diffusion method. Results showed that most isolates were multi-antimicrobial resistance. R. anatipestifer isolates were most resistant to colistin, nalidixic acid and kanamycin and most susceptible to nitrofurantoin which has been banned for use in domestic animals in 2004, doxycycline and amoxycillin/clavulanic acid. Furthermore, the resistance rates to several antimicrobials and multi-resistance were increased obviously in 2009. In addition, this study investigated the mutations of gyrase associated with quinolone resistance in R. anatipestifer. Most isolates with reduced susceptibility to quinolones possessed amino acid alterations at Ser10→Pro and/or Ser83→Arg or Ile in GyrA and at Thr140→Ile, Ile503→Val and/or Gln155→Val in GyrB. Noteworthily, one isolate with an unusual susceptibility profile which was nalidixic acid-susceptible but enrofloxacin-resistant possessed only one mutation at Gly81→ Asp in GyrA and no change in GyrB. Results of this study can be used to select effective chemotherapies for R. anatipestifer infection in Taiwan. In addition, this study also provides information on a potential association between gyrase mutations and quinolone resistance in R. anatipestifer.
This study evaluated the susceptibility of 222 Taiwanese Riemerella anatipestifer isolated from domestic waterfowl between 1999 and 2009 to 22 antimicrobials by agar disk diffusion method. Results showed that most isolates were multi-antimicrobial resistance. R. anatipestifer isolates were most resistant to colistin, nalidixic acid and kanamycin and most susceptible to nitrofurantoin which has been banned for use in domestic animals in 2004, doxycycline and amoxycillin/clavulanic acid. Furthermore, the resistance rates to several antimicrobials and multi-resistance were increased obviously in 2009. In addition, this study investigated the mutations of gyrase associated with quinolone resistance in R. anatipestifer. Most isolates with reduced susceptibility to quinolones possessed amino acid alterations at Ser10→Pro and/or Ser83→Arg or Ile in GyrA and at Thr140→Ile, Ile503→Val and/or Gln155→Val in GyrB. Noteworthily, one isolate with an unusual susceptibility profile which was nalidixic acid-susceptible but enrofloxacin-resistant possessed only one mutation at Gly81→ Asp in GyrA and no change in GyrB. Results of this study can be used to select effective chemotherapies for R. anatipestifer infection in Taiwan. In addition, this study also provides information on a potential association between gyrase mutations and quinolone resistance in R. anatipestifer.
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