ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (11): 2451-2460.doi: 10.11843/j.issn.0366-6964.2018.11.017

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Isolation,Identification and Phylogenetic Analysis of Gallibacterium anatis from Silky Population in Henan Province, China

HUANGFU He-ping*, DU Zhen-long, DONG Qing, WANG Hong-kui, SUN Yan-ting, GUO Hong-wei, JI Xiang-bo, JIA Han-xiao, YU Meng-wei, BU Ya-ge   

  1. Henan University of Animal Husbandry and Economy, Zhengzhou 450046, China
  • Received:2018-02-27 Online:2018-11-23 Published:2019-01-23

Abstract:

In order to understand the epidemic situation of Gallibacterium in silky and the genetic evolution characteristics of isolates, samples were collected for the isolation of Gallibacterium anatis and q-PCR identification from two silky farms in Xinyang and Nanyang, Henan province, then isolates were detected by Gallibacterium specific PCR followed by drug susceptibility test, and the PCR amplification and sequencing of the 16S rRNA, rpoB and gyrB genes. Finally, the MegAlign program was used for calculating the similarity between isolates of G. anatis, and MEGA5.0 for constructing evolutionary tree and genetic evolution analysis. Results were as follows:Of 22 silky chickens, 16 were found positive to G. anatis, the positive rate was 72.7%; the four Gallibacterium isolates were identified as G. anatis; the four isolates were all multidrug resistant, and were sensitive to ceftriaxone, cefotaxime, amikacin and tobramycin only; the homology between the isolates and the reference G. anatis species was 99.1%-99.8% (16S rRNA), 85.4%-99.6% (rpoB), and 92.7%-99.8% (gyrB), respectively. In the 16S rRNA gene evolution tree, the four isolates and the reference G. anatis were located in the same branch; the GAC193 isolate in the rpoB gene evolution tree were located in the same branch with Pasteurella multocida, not in the same branch with other G. anatis; in the gyrB gene evolution tree, GAC017 and G. genomosp.1 were in a small branch. The results showed that G. anatis were found in the silky chickens with a high detection rate, and four strains of G. anatis were isolated, which showing serious multidrug resistance. There are significant genetic differences in the rpoB and gyrB gene of some isolates of G. anatis.

Key words: silky, Gallibacterium anatis, isolation and identification, drug sensitivity test, phylogenetic analysis

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