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To investigate the genetic basis of erythromycin resistance in  Riemerella anatipestifer , the MIC to erythromycin of 79  R .  anatipestifer  isolates from China and one typed strain, ATCC11845, were evaluated. The results showed that 43 of 80 (53.8%) of the tested  R .  anatipestifer  strains showed resistance to erythromycin, and 30 of 43 erythromycin-resistant  R .  anatipestifer  strains carried  ermF  or  ermFU  with an MIC in the range of 32–2048 μg/ml, while the other 13 strains carrying the  ereD  gene exhibited an MIC of 4–16 μg/ml. Of 30  ermF  +  R .  anatipestifer  strains, 27 (90.0%) carried the  ermFU  gene which may have been derived from the CTnDOT-like element, while three other strains carried  ermF  from transposon Tn4351. Moreover, sequence analysis revealed that  ermF ,  ermFU , and  ereD  were located within the multiresistance region of the  R .  anatipestifer  genome.

ErmF and ereD Are Responsible for Erythromycin Resistance in Riemerella anatipestifer