China Animal Husbandry and Veterinary Medicine ›› 2020, Vol. 47 ›› Issue (6): 1952-1960.doi: 10.16431/j.cnki.1671-7236.2020.06.035

• Basic Veterinary Medicine • Previous Articles     Next Articles

Isolation,Identification and Biological Characteristics of a Pathogon of Salmonella Agona Originated from Pigeon

LI Tingcui1,2, LI Ke1, YAN Hongya1, ZHAO Rong1, TANG Yaqi1,2, CHANG Zhishun1, ZOU Fengcai2, XIN Aiguo1   

  1. 1. Poultry and Poultry Disease Institute, Yunnan Animal Science and Veterinary Institute, Kunming 650224, China;
    2. College of Animal Medicine, Yunnan Agricultural University, Kunming 650201, China
  • Received:2019-09-29 Online:2020-06-20 Published:2020-06-20

Abstract: In order to understand the cause of the disease in a pigeon farm in Yunnan,a treatment plan was developed.The liver tissues of sick pigeons were collected aseptically and streaked on MacConkey medium for bacterial isolation and culture,biochemical identification,serotype identification,16S rDNA homology analysis,animal regression experiments,drug sensitivity tests and virulence analysis.The results showed that round,smooth,colorless and translucent colonies were observed on the MacConkey medium,which were initially identified as Gram-negative bacteria.The strain was identified as Salmonella Agona by Salmonella serum agglutination test and 16S rDNA homology analysis.Its antigenic structural formula was O antigen 1(+),4(+),12(+),H antigen fg(+),s(+),which was named SSYN036 strain.The growth curve of bacteria showed that the strain grow faster.Animal experiments showed the strain was highly pathogenic to the test mice,the inoculated with 5×108,5×107,5×106 and 5×105 CFU/mL of mice,within 7 days,which mortality were 100%,100%,60% and 30%,respectively.The pathological sections showed more obvious focal necrotic inflammation and inflammatory cell infiltration.The drug sensitivity test showed that the strain was resistant to penicillin,oxacillin,streptomycin,doxycycline and tetracycline,moderately sensitive to rifampicin,and sensitive to amoxicillin,ampicillin,gentamicin,tobramycin,ceftazidime,etc.11 antibacterial drugs.Virulence gene test showed that the strain contains spvB,spiA,pagC,msgA,invA,sipB,prgH,spaN,tolC,iroN,sitC,lpfC,sifA,sopB and pefA genes.This study provided new data information of the pathogenicity of Salmonella and the biological characteristics of strains,and its public health significance was worthy of attention.

Key words: pigeon; Salmonella Agona; isolation and identification; biological characteristics; drug susceptibility test

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