Acta Veterinaria et Zootechnica Sinica ›› 2023, Vol. 54 ›› Issue (3): 1199-1209.doi: 10.11843/j.issn.0366-6964.2023.03.031

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Genomic Analysis of Salmonella Typhimurium Isolates and Salmonella Serotype 4, [5], 12: i:- Isolates from Pig-borne Food Chain

JIANG Zenghai1,3, TENG Lin2, HE Anwen1, LIU Yanyan1, YUE Min2, HE Qigai3*   

  1. 1. College of Veterinary Medicine, Henan University of Animal Husbandry and Economy, Zhengzhou 450046, China;
    2. Institute of Preventive Veterinary Medicine & Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China;
    3. College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
  • Received:2022-03-23 Online:2023-03-23 Published:2023-03-21

Abstract: Whole genomes of 91 Salmonella isolates from pig-borne food chain of Henan province were sequenced by Illumina NovaSeq 6000 platform for the understanding of genomic characteristics of Salmonella typhimurium and Salmonella serotype 4,[5],12:i:-. Serotype prediction, multi-locus sequence typing, plasmid types, virulence genes and drug resistance genes were analyzed by bioinformatics. The results showed that the prevalence of Salmonella 4,[5],12:i:- (1.58%, 50/3 173) was higher than that of Salmonella typhimurium (1.29%, 41/3 173) in pig-borne food chain of Henan Province. Sequence types(STs) of 91 Salmonella isolates included ST34 (71.42%, 65/91) and ST19 (28.57%, 26/91). Typhimurium/ST34 strains and 4,[5],12:i:-/ST34 strains were the preferred hosts of some plasmids including IncHI2A _1, IncHI2 _1 and Col440I _1. Resistant genes highly carried by Salmonella serotypes 4,[5],12:i:- were blaTEM-1B_1 (72%), tet (B)_2 (90%), sul2_3 (66%), blaOXA-1_1 (34%), etc. Compared with Salmonella typhimurium isolates, Salmonella serotype 4,[5],12:i:- isolates had a higher plasmid-carrying rate, carrying a greater variety of resistance genes and virulence genes. This study confirmed for the first time that the prevalence of Salmonella serotype 4,[5],12:i:- has exceeded that of Salmonella typhimurium in pig-borne food chain of Henan Province. To a certain extent, this may explain the predominant prevalence of the Salmonella serotype among patients in the area.

Key words: Salmonella serotype 4,[5],12:i-, Salmonella typhimurium monophasic variant, pig-borne food chain, genomics, drug-resistant genes, virulence genes

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