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Iduu NV, Raiford D, Conley A, Scaria J, Nelson J, Ruesch L, Price S, Yue M, Gong J, Wei L, Wang C. A Retrospective Analysis of Salmonella Isolates across 11 Animal Species (1982-1999) Led to the First Identification of Chromosomally Encoded blaSCO-1 in the USA. Microorganisms 2024; 12:528. [PMID: 38543579 PMCID: PMC10974302 DOI: 10.3390/microorganisms12030528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 02/29/2024] [Accepted: 03/04/2024] [Indexed: 04/01/2024] Open
Abstract
Antimicrobial resistance (AMR) in non-typhoidal Salmonella is a pressing public health concern in the United States, necessitating continuous surveillance. We conducted a retrospective analysis of 251 Salmonella isolates from 11 animal species recovered between 1982 and 1999, utilizing serotyping, antimicrobial susceptibility testing, and whole-genome sequencing (WGS). Phenotypic resistance was observed in 101 isolates, with S. Typhimurium, S. Dublin, S. Agona, and S. Muenster prevailing among 36 identified serovars. Notably, resistance to 12 of 17 antibiotics was detected, with ampicillin being most prevalent (79/251). We identified 38 resistance genes, primarily mediating aminoglycoside (n = 13) and β-lactamase (n = 6) resistance. Plasmid analysis unveiled nine distinct plasmids associated with AMR genes in these isolates. Chromosomally encoded blaSCO-1 was present in three S. Typhimurium and two S. Muenster isolates from equine samples, conferring resistance to amoxicillin/clavulanic acid. Phylogenetic analysis revealed three distinct clusters for these five isolates, indicating evolutionary divergence. This study represents the first report of blaSCO-1 in the USA, and our recovered isolates harboring this gene as early as 1989 precede those of all other reports. The enigmatic nature of blaSCO-1 prompts further research into its function. Our findings highlight the urgency of addressing antimicrobial resistance in Salmonella for effective public health interventions.
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Affiliation(s)
- Nneka Vivian Iduu
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA; (N.V.I.); (D.R.); (S.P.)
| | - Donna Raiford
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA; (N.V.I.); (D.R.); (S.P.)
| | - Austin Conley
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA; (N.V.I.); (D.R.); (S.P.)
| | - Joy Scaria
- Department of Veterinary Pathobiology, Stillwater, Oklahoma State University, Stillwater, OK 74078, USA;
| | - Julie Nelson
- Department of Veterinary & Biomedical Sciences, South Dakota State University, Brookings, SD 57007, USA; (J.N.); (L.R.)
| | - Laura Ruesch
- Department of Veterinary & Biomedical Sciences, South Dakota State University, Brookings, SD 57007, USA; (J.N.); (L.R.)
| | - Stuart Price
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA; (N.V.I.); (D.R.); (S.P.)
| | - Min Yue
- Department of Veterinary Medicine, Zhejiang University, Hangzhou 310027, China
| | - Jiansen Gong
- Poultry Institute, Chinese Academy of Agricultural Sciences, Yangzhou 225125, China;
| | - Lanjing Wei
- Bioengineering Program, The University of Kansas, Lawrence, KS 66045, USA;
| | - Chengming Wang
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA; (N.V.I.); (D.R.); (S.P.)
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Barrera S, Vázquez-Flores S, Needle D, Rodríguez-Medina N, Iglesias D, Sevigny JL, Gordon LM, Simpson S, Thomas WK, Rodulfo H, De Donato M. Serovars, Virulence and Antimicrobial Resistance Genes of Non-Typhoidal Salmonella Strains from Dairy Systems in Mexico. Antibiotics (Basel) 2023; 12:1662. [PMID: 38136696 PMCID: PMC10740734 DOI: 10.3390/antibiotics12121662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 11/06/2023] [Accepted: 11/07/2023] [Indexed: 12/24/2023] Open
Abstract
Salmonella isolated from dairy farms has a significant effect on animal health and productivity. Different serogroups of Salmonella affect both human and bovine cattle causing illness in both reservoirs. Dairy cows and calves can be silent Salmonella shedders, increasing the possibility of dispensing Salmonella within the farm. The aim of this study was to determine the genomic characteristics of Salmonella isolates from dairy farms and to detect the presence of virulence and antimicrobial resistance genes. A total of 377 samples were collected in a cross-sectional study from calves, periparturient cow feces, and maternity beds in 55 dairy farms from the states of Aguascalientes, Baja California, Chihuahua, Coahuila, Durango, Mexico, Guanajuato, Hidalgo, Jalisco, Queretaro, San Luis Potosi, Tlaxcala, and Zacatecas. Twenty Salmonella isolates were selected as representative strains for whole genome sequencing. The serological classification of the strains was able to assign groups to only 12 isolates, but with only 5 of those being consistent with the genomic serotyping. The most prevalent serovar was Salmonella Montevideo followed by Salmonella Meleagridis. All isolates presented the chromosomal aac(6')-Iaa gene that confers resistance to aminoglycosides. The antibiotic resistance genes qnrB19, qnrA1, sul2, aph(6)-Id, aph(3)-ld, dfrA1, tetA, tetC, flor2, sul1_15, mph(A), aadA2, blaCARB, and qacE were identified. Ten pathogenicity islands were identified, and the most prevalent plasmid was Col(pHAD28). The main source of Salmonella enterica is the maternity areas, where periparturient shedders are contaminants and perpetuate the pathogen within the dairy in manure, sand, and concrete surfaces. This study demonstrated the necessity of implementing One Health control actions to diminish the prevalence of antimicrobial resistant and virulent pathogens including Salmonella.
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Affiliation(s)
- Stephany Barrera
- Tecnologico de Monterrey, School of Engineering and Sciences, Querétaro 76130, CP, Mexico; (S.B.); (D.I.); (H.R.)
| | - Sonia Vázquez-Flores
- Tecnologico de Monterrey, School of Engineering and Sciences, Querétaro 76130, CP, Mexico; (S.B.); (D.I.); (H.R.)
| | - David Needle
- Veterinary Diagnostic Lab, University of New Hampshire, Durham, NH 03824, USA;
| | - Nadia Rodríguez-Medina
- Instituto Nacional de Salud Pública (INSP), Centro de Investigación Sobre Enfermedades Infecciosas (CISEI), Cuernavaca 62100, MR, Mexico;
| | - Dianella Iglesias
- Tecnologico de Monterrey, School of Engineering and Sciences, Querétaro 76130, CP, Mexico; (S.B.); (D.I.); (H.R.)
| | - Joseph L. Sevigny
- Department Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH 03824, USA; (J.L.S.); (L.M.G.); (S.S.); (W.K.T.)
| | - Lawrence M. Gordon
- Department Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH 03824, USA; (J.L.S.); (L.M.G.); (S.S.); (W.K.T.)
| | - Stephen Simpson
- Department Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH 03824, USA; (J.L.S.); (L.M.G.); (S.S.); (W.K.T.)
| | - W. Kelley Thomas
- Department Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH 03824, USA; (J.L.S.); (L.M.G.); (S.S.); (W.K.T.)
| | - Hectorina Rodulfo
- Tecnologico de Monterrey, School of Engineering and Sciences, Querétaro 76130, CP, Mexico; (S.B.); (D.I.); (H.R.)
| | - Marcos De Donato
- Tecnologico de Monterrey, School of Engineering and Sciences, Querétaro 76130, CP, Mexico; (S.B.); (D.I.); (H.R.)
- The Center for Aquaculture Technologies, San Diego, CA 92121, USA
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