Staphylococcus aureus (S. aureus) (S. aureus)

Staphylococcus aureus is a Gram-positive, round-shaped bacterium that is a common member of the human microbiota, typically colonizing the skin and nares [StatPearls: Staphylococcus Aureus]. While often harmless, it is a versatile pathogen capable of causing a wide spectrum of diseases, from superficial skin abscesses to life-threatening systemic infections such as endocarditis, osteomyelitis, and sepsis [CDC: Staph Infections]. Susceptible strains, often referred to as Methicillin-Susceptible Staphylococcus aureus (MSSA), lack the mecA gene and remain sensitive to beta-lactamase-resistant penicillins and other standard antibiotics [Nature Reviews Microbiology: Staphylococcus aureus]. The pathogenicity of S. aureus is driven by an extensive repertoire of virulence factors, including surface proteins for adhesion, enzymes that degrade host tissues, and toxins that disrupt host cell membranes or trigger massive immune responses [PubMed: Antibiotic mechanisms of action]. Therapeutic intervention focuses on targeting essential bacterial components, such as the cell wall, ribosomes, or DNA replication machinery, to achieve bactericidal or bacteriostatic effects [StatPearls: Staphylococcus Aureus].

Other names

S. aureusGolden staphMSSAMethicillin-susceptible Staphylococcus aureus

Antibiotics targeting susceptible S. aureus act through various mechanisms: beta-lactams and glycopeptides inhibit cell wall peptidoglycan synthesis; macrolides, lincosamides, and oxazolidinones inhibit protein synthesis at the ribosome; and lipopeptides disrupt the bacterial cell membrane integrity.