Whole genome sequencing and molecular epidemiology of clinical isolates of Staphylococcus aureus from Algeria

Rachida Namoune, Abla Djebbar, Rebecca Mekler, Martin Patrick McHugh, Mohammed El Amine Bekara, Arun Decano, Matthew Holden*, Mohammed Sebaihia*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Staphylococcus aureus is an important pathogen responsible for various healthcare- and community-acquired infections. In this study, whole genome sequencing (WGS) was used to genotype S. aureus clinical isolates from two hospitals in Algeria and to characterize their genetic determinants of antimicrobial resistance. Seventeen S. aureus isolates were included in this study. WGS, single-nucleotide polymorphism (SNP)-based phylogenetic analysis, in silico multilocus sequence typing (MLST), spa and staphylococcal cassette chromosome mec (SCCmec) typing and in silico antimicrobial resistance profiling were performed. Phenotypic antibiotic susceptibility testing was performed using the Vitek 2 system and the disk diffusion method. The isolates were separated into sequence types (STs), with ST80 being predominant; five clonal complexes (CCs); four spa types (t044, t127, t368, t386); and two SCCmec types (IVc and IVa). Whole genome analysis revealed the presence of the resistance genes mecA, blaZ, ermC, fusB, fusC, tetK, aph(3′)-IIIa and aad(6) and mutations conferring resistance in the genes parC and fusA. The rate of multidrug resistance (MDR) was 64%. This work provides a high-resolution characterization of methicillin-resistant S. aureus (MRSA) and methicillin-susceptible S. aureus (MSSA) isolates and emphasizes the importance of continuous surveillance to monitor the spread of S. aureus in healthcare settings in the country.
Original languageEnglish
Article number2047
Number of pages11
Issue number8
Publication statusPublished - 9 Aug 2023


  • Staphylococcus aureus
  • MRSA
  • WGS
  • MLST
  • Antibiotic resistance
  • Algeria


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