1887

Abstract

serovar Isangi (. Isangi) is a rare non-typhoidal serovar, related to invasive nosocomial infections in various countries and to increasing antimicrobial resistance rates.

Despite existing reports on . Isangi, there is a lack of information of specific traits regarding this serovar, which could be improved through genomic analyses.

Our goals were to characterize the antimicrobial resistance, virulence potential and genomic relatedness of 11 . Isangi strains from Brazil in comparison to 185 genomes of global isolates using whole-genome sequencing (WGS) data.

Phenotypic resistance was determined by disc-diffusion. The search for resistance genes, plasmids, prophages, pathogenicity islands (SPIs) and virulence genes, plus multi-locus sequence typing (MLST) and core-genome MLST (cgMLST) were performed using WGS.

Brazilian . Isangi strains showed phenotypic resistance to nalidixic acid, ciprofloxacin and streptomycin, and harboured antimicrobial resistance [, , ] and heavy metal tolerance () genes. Col(pHAD28) and IncFII(S) plasmids, virulence genes related to adherence, macrophage induction, magnesium uptake, regulation and type III secretion systems, 12 SPIs and eight prophages were detected. The 185 additional global genomes analysed harboured resistance genes against 11 classes of antimicrobial compounds, 22 types of plasmids, 32 prophages, 14 SPIs, and additional virulence genes related to serum resistance, stress adaptation and toxins. Sequence type (ST)216 was assigned to genomes from Brazil and other countries, while ST335 was the most frequent ST, especially among South African genomes. cgMLST showed that Brazilian genomes were more closely related to genomes from European and African countries, the USA and Taiwan, while the majority of South African genomes were more closely related among each other.

The presence of . Isangi strains from Brazil and different countries showing a close genomic correlation, antimicrobial resistance profiles to drugs used in human therapy and a large number of virulence determinants reinforced the need for stronger initiatives to monitor rare non-typhoidal serovars such as . Isangi in order to prevent its dissemination among human and non-human sources.

Funding
This study was supported by the:
  • Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Award Finance Code 001)
    • Principle Award Recipient: FelipePinheiro Vilela
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (Award 304803/2021-9)
    • Principle Award Recipient: JulianaPfrimer Falcao
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (Award 304399/2018-3)
    • Principle Award Recipient: JulianaPfrimer Falcao
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (Award 141017/2021-0)
    • Principle Award Recipient: FelipePinheiro Vilela
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (Award 2019/19338-8)
    • Principle Award Recipient: JulianaPfrimer Falcao
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/content/journal/jmm/10.1099/jmm.0.001736
2023-07-18
2024-06-25
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