Whole-genome sequencing of bloodstream Staphylococcus aureus isolates does not distinguish bacteraemia from...

Area of Science:

• Microbiology
• Genomics
• Infectious Diseases

Background:

• Staphylococcus aureus is a common cause of bloodstream infections.
• It remains unclear if certain S. aureus strains are predisposed to causing severe invasive diseases such as infective endocarditis.

Purpose of the Study:

• To determine if specific S. aureus genotypes are associated with infective endocarditis in patients with S. aureus bacteremia.

Main Methods:

• Whole-genome sequencing was performed on S. aureus bloodstream isolates from patients with infective endocarditis and bacteremia without endocarditis.
• Genome-wide association analysis, including SNP, accessory genome, and k-mer based analyses, was employed.

Main Results:

• Core and accessory genome analyses did not reveal any association between specific S. aureus genotypes and the clinical groups (infective endocarditis vs. bacteremia).
• Genome sequences of S. aureus bloodstream isolates could not differentiate between bacteremia and infective endocarditis.

Conclusions:

• The study did not find convincing evidence that a specific S. aureus genotype is clearly associated with infective endocarditis in patients with S. aureus bacteremia.
• Further research may be needed to explore potential host factors or other microbial elements contributing to disease severity.