China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (1): 338-347.doi: 10.16431/j.cnki.1671-7236.2021.01.037

• Basic Veterinary Medicine • Previous Articles     Next Articles

Isolation,Identification,Drug Resistance and Virulence Analysis of one Salmonella Typhimurium Strain from Racing Pigeons

ZHANG Qilong, LI Yunpeng, FU Caixia, LIU Haiying, ZHANG Wei, WANG Lin, WU Di, LIU Xiaodong, ZHOU Degang   

  1. Beijing Center for Animal Disease Control and Prevention, Beijing 102629, China
  • Received:2020-06-17 Online:2021-01-20 Published:2021-01-15

Abstract: The purpose of this research was to identify the etiology of dead pigeons which clinically suspected Salmonella infection,and to analyze the drug resistance and virulence of pathogenic bacteria.A series of tests including bacterial isolation and culture,colonial morphology observation,staining microscopy,biochemical identification,serotype analysis,16S rRNA gene sequencing analysis,serum plate agglutination test of rehabilitated racing pigeons were used for indentification,drug sensitivity test,drug resistance genes and virulence genes detection were carried out to analyze drug resistance and virulence.The results showed that the isolated bacteria were black colonies on the BS,XLD and HE medium,and the bacteria were Gram-negative short-bacillus without capsule and spores under microscope observation,the biochemical reaction results of the isolated strain conformed to the biochemical characteristics of Salmonella,the serotype of the isolated strain was 1,4,12:i:1,2.The phylogenetic tree analysis of the 16S rRNA gene sequence showed that the isolated bacterial strain and Salmonella Typhimurium were clustered into one branch with the homology >99%.Specific agglutination occurred between the serum of rehabilitated racing pigeons and isolated strain,therefore the isolated bacterial strain was identified as Salmonella Typhimurium considering the results of biochemical identification and serotype detection.The results of drug sensitivity test and drug resistance gene test showed that the isolated bacterial strain was resistant to florfenicol,the floR and cmlA genes of chloramphenicol resistance in isolated bacterial strain were detected which was consistent with the drug resistance phenotype.The isolated bacterial strain was tested positive for 17 virulence genes including mogA and so on.In this study,one strain of Salmonella Typhimurium was successfully isolated and identified from racing pigeons,which was resistant to florfenicol and had highly virulence,providing reference for the prevention and treatment of Salmonella infection in racing pigeons in the next work.

Key words: racing pigeon; Salmonella Typhimurium; isolation; identification; drug resistance; virulence

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