Genomic and Evolutionary Analysis of Salmonella enterica Serovar Kentucky Sequence Type 198 Isolated From Livestock In East Africa

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Sousa Saraiva, Mauro de Mesquita ; Benevides, Valdinete Pereira ; Vieira da Silva, Nubia Michelle ; Varani, Alessandro de Mello ; de Freitas Neto, Oliveiro Caetano ; Berchieri, Angelo ; Delgado-Suarez, Enrique Jesus ; de Lima Rocha, Alan Douglas ; Eguale, Tadesse ; Munyalo, Janet Agnes ; Kariuki, Samuel ; Gebreyes, Wondwossen Abebe ; Bruno de Oliveira, Celso Jose

• Document type: Journal article
• Source: FRONTIERS IN CELLULAR AND INFECTION MICROBIOLOGY; v. 12, p. 12-pg., 2022-06-20.

Abstract

Since its emergence in the beginning of the 90's, multidrug-resistant (MDR) Salmonella enterica subsp. enterica serovar Kentucky has become a significant public health problem, especially in East Africa. This study aimed to investigate the antimicrobial resistance profile and the genotypic relatedness of Salmonella Kentucky isolated from animal sources in Ethiopia and Kenya (n=19). We also investigated population evolutionary dynamics through phylogenetic and pangenome analyses with additional publicly available Salmonella Kentucky ST198 genomes (n=229). All the 19 sequenced Salmonella Kentucky isolates were identified as ST198. Among these isolates, the predominant genotypic antimicrobial resistance profile observed in ten (59.7%) isolates included the aac(3)-Id, aadA7, strA-strB, blaTEm-,B, sull, and tet(A) genes, which mediated resistance to gentamicin, streptomycin/spectinomycin, streptomycin, ampicillin, sulfamethoxazole and tetracycline, respectively; and gyrA and parC mutations associated to ciprofloxacin resistance. Four isolates harbored plasmid types Inch and/or Co18282; two of them carried both plasmids. Salmonella Pathogenicity islands (SPI-1 to SPI-5) were highly conserved in the 19 sequenced Salmonella Kentucky isolates. Moreover, at least one Pathogenicity Island (SPI 1-4, SPI 9 or C63P1) was identified among the 229 public Salmonella Kentucky genomes. The phylogenetic analysis revealed that almost all Salmonella Kentucky ST198 isolates (17/19) stemmed from a single strain that has accumulated ciprofloxacin resistance-mediating mutations. A total of 8,104 different genes were identified in a heterogenic and still open Salmonella Kentucky ST198 pangenome. Considering the virulence factors and antimicrobial resistance genes detected in Salmonella Kentucky, the implications of this pathogen to public health and the epidemiological drivers for its dissemination must be investigated. (AU)

• FAPESP's process: 18/21301-2 - Evaluation of avian infection (Gallus gallus domesticus) by Salmonella enteritidis, Salmonella typhimurium and Salmonella heidelberg containing deletion of the ttrA and pduA genet
• Grantee: Mauro de Mesquita Souza Saraiva
• Support Opportunities: Scholarships in Brazil - Post-Doctoral