ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2017, Vol. 48 ›› Issue (11): 2157-2165.doi: 10.11843/j.issn.0366-6964.2017.11.017

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Distribution of Serovars and Virulence Genes in Salmonella Isolates from Goats in Sichuan Province

XIA Bin-yan, WANG Jing-jing, TANG Cheng, TAN Shuo, FENG Fan, CHEN Ji-kui, YUE Hua*   

  1. College of Life Science and Technology, Southwest University for Nationalities, Chengdu 610041, China
  • Received:2017-06-06 Online:2017-11-23 Published:2017-11-23

Abstract:

The aim of this study was to investigate the serovars and virulence genes as well as the pathogenicity of Salmonella isolates from goats in Sichuan Province, which will provide the information for food safety. The 42 Salmonella strains from goats were identified by the mono-specific serum, and the carrying rates of 15 virulence genes, including invA, sopE, orgA, avrA, ttrB, sseL, rhuM, mgtC, orfL,sopB, pipD,sodC1, lpfC, pefA and spvC, were detected by PCR. According to the results of serovars and virulence genes, 6 of the Salmonella strains were selected and studied the pathogenicity in BALB/c mice by oral infection. The serotyping results exhibited that the 42 Salmonella isolates were divide into 4 different serovars, incuding S. Blegdam (23/42), S. Enterica (15/42), S. Agona (3/42) and S. Newport (1/42). In 42 Salmonella strains, all isolates carried the five virulence genes of invA, orgA, pipD, sopB and lpfC. The carrying rates of the virulence genes of sopE, sseL, ttrB, rhuM, sodC1, pefA, spvC, avrA,mgtC and orfL were 97.6%, 97.6%, 88.1%, 95.2%, 92.9%, 47.6%, 47.6%, 40.5%, 40.5% and 38.1%, respectively. Each strain carried at least 6 virulence genes, and two S. Agona strains carried virulence plasmid. There were two of S. enteritidis strains, two of S. Blegdam strains and two of S. Agona strains carrying 15 virulence genes, which could killed the no-antibiotics treated mice at the doses of 5×108 CFU. Furthermore, the LD50 of the S.enteritidis strain SWUN3816 was 1.6×102 CFU to mice. Both S. Blegdam and S. Enterica were dominant serovars from goats in Sichuan Province, and it was first to identify the S. Agona strain carrying virulence plasmid.

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