Abstract
Salmonella is an important poultry pathogen with zoonotic potential. Being a foodborne pathogen, Salmonella-contaminated poultry products can act as the major source of infection in humans. In India, limited studies have addressed the diversity of Salmonella strains of poultry origin. This study represented 26 strains belonging to Salmonella serovars Typhimurium, Infantis, Virchow, Kentucky, and Agona. The strains were tested for resistance to 14 different antimicrobial agents using the Kirby-Bauer disk-diffusion assay. The presence of the invA, hilA, agfA, lpfA, sopE, and spvC virulence genes was assessed by polymerase chain reaction (PCR), and the genetic diversity was assessed by Enterobacterial Repetitive Intergenic Consensus Polymerase Chain Reaction (ERIC-PCR). The highest resistance to tetracycline (n = 17; 65.38%) followed by nalidixic acid (n = 16; 61.53%) was detected among the strains. Among the strains (n = 17) phenotypically resistant to tetracycline, 94% (n = 16) were also positive for the tetA gene. Based on the presence of virulence genes, the strains were characterized into three virulence profiles (PI, P2, and P3). Among the investigated virulence genes, invA, hilA, agfA, and lpfA were present in all strains. The sopE gene was mostly associated with serovars Virchow (n = 3; 100%) and Typhimurium (n = 8; 80%), whereas spvC gene was exclusive for two Typhimurium strains that lacked sopE gene. ERIC-PCR profiling indicated clusters correlating their serovar, geographical, and farm origins. These results demonstrate that Salmonella isolates with a wide genetic range, antibiotic resistance, and virulence characteristics can colonize poultry. The presence of such strains is crucial for both food safety and public health.
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Data availability
The data that support the findings of this study are available on request from the corresponding author.
Abbreviations
- NTS:
-
Non-typhoidal Salmonella
- ERIC-PCR:
-
Enterobacterial Repetitive Intergenic Consensus PCR
- AMR:
-
Antimicrobial resistance
- MDR:
-
Multidrug-resistant
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DG and PT conceptualized and designed the study. DG, YMI, and AS carried out strain isolation and culturing. AKM carried out postmortem examination and sampling. DG, LP, SI and SN carried out AMR studies and virulence profiling. AB and PT carried out serotyping. SK generated ERIC profiles. PT and VC supervised the study. DG, LP, MS, PD, and PT wrote the manuscript. All authors contributed to manuscript revision and read and approved the submitted version.
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Geyi, D., Thomas, P., Prakasan, L. et al. Salmonella enterica serovars linked with poultry in India: antibiotic resistance profiles and carriage of virulence genes. Braz J Microbiol 55, 969–979 (2024). https://doi.org/10.1007/s42770-024-01252-x
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DOI: https://doi.org/10.1007/s42770-024-01252-x