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Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms
Open accessAbstract
Staphylococcus aureus is a formidable human pathogen responsible for infections ranging from superficial skin lesions to life-threatening systemic diseases. This review synthesizes current knowledge on its pathogenesis, emphasizing colonization dynamics, virulence mechanisms, biofilm formation, and antibiotic resistance. By analyzing studies from PubMed, Scopus, and Web of Science, we highlight the pathogen’s adaptability, driven by surface adhesins (e.g., ClfB, SasG), secreted toxins (e.g., PVL, TSST-1), and metabolic flexibility in iron acquisition and amino acid utilization. Nasal, skin, and oropharyngeal colonization are reservoirs for invasive infections, with biofilm persistence and horizontal gene transfer exacerbating antimicrobial resistance, particularly in methicillin-resistant S. aureus (MRSA). The review underscores the clinical challenges of multidrug-resistant strains, including vancomycin resistance and decolonization strategies’ failure to target single anatomical sites. Key discussions address host–microbiome interactions, immune evasion tactics, and the limitations of current therapies. Future directions advocate for novel anti-virulence therapies, multi-epitope vaccines, and AI-driven diagnostics to combat evolving resistance. Strengthening global surveillance and interdisciplinary collaboration is critical to mitigating the public health burden of S. aureus.
Checked 2026-11-15 · 5 references not checked yet
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TL;DR
This review synthesizes current knowledge on *Staphylococcus aureus* pathogenesis, colonization, virulence factors, biofilm formation, antibiotic resistance, and emerging therapeutic strategies. It emphasizes the pathogen’s adaptability through adhesins, secreted toxins, metabolic flexibility, and horizontal gene transfer, and argues for anti-virulence therapies, vaccines, phage/CRISPR/nanotechnology, and strengthened surveillance.
Key findings
- Colonization is dynamic: approximately 30% of individuals are persistently colonized, 30% intermittently, and 40% are non-carriers; the anterior nares are the primary niche. Nasal MRSA/MSSA rates vary widely—community MSSA 12–30% and MRSA 1–3%, with examples such as 51.2% MSSA/1.2% MRSA among homeless individuals in Lisbon and 42.7% MSSA/14% MRSA in Sierra Leone. Throat carriage can exceed nasal carriage (40% vs 31%; exclusive throat carriage 30.2% in community participants vs 18.4% in hospitalized patients/healthcare workers), and biofilm-forming strains are 3–5 times more likely to persist in the throat. Nasal mupirocin reduced nasal MRSA by 50% but did not significantly impact throat carriage.
- Virulence is driven by surface adhesins (e.g., ClfB, SasG, MSCRAMMs) and secreted toxins (e.g., PVL, TSST-1, alpha-hemolysin). PVL genes are rare in nasal carriage isolates (0.6–2.1%) but prevalent in skin/soft tissue infections (38.9%) and necrotizing pneumonia (>90%); PVL-positive necrotizing pneumonia mortality is 56–75%, and recurrence rates are threefold higher than PVL-negative isolates. PVL targets C5aR/C5L2, with sublytic concentrations (~5 nM) inducing apoptosis and higher concentrations (~200 nM) causing necrosis.
- Resistance mechanisms include *mecA*/*mecC*-encoded PBP2a and SCC*mec* for MRSA, *vanA*/*vanB* for VRSA, and thickened cell walls/metabolic adaptations for VISA. Reported VRSA prevalence is 1.2% in Asia, 1.1% in Europe, 3.6% in America, and 2.5% in Africa, with country examples such as Saudi Arabia (18%) and Nigeria (29%).
- Emerging strategies include monoclonal antibodies, multivalent vaccines, CRISPR-Cas9 targeting *mecA*/*blaZ*/*icaA*, phage StAP1 lysing 46.3% of clinical MRSA isolates, endolysins reducing MRSA populations by 90%, dPNAG vaccines reducing bacteremia by 54–91% in murine models, and surface coatings reducing bacterial adhesion by 40–94%.
Methods
- Narrative review synthesizing studies identified from PubMed, Scopus, and Web of Science; no primary data are reported.
- Thematic synthesis covers colonization dynamics, virulence factors, regulation (*agr*/*sar*), antibiotic resistance mechanisms, MRSA/VRSA epidemiology, and emerging therapeutic strategies, including tables of colonization and VRSA prevalence.
Limitations
- Stated in the paper: PVL’s pathogenic role remains debated because murine models lack compatible C5aR isoforms and other toxins can replicate necrotizing effects; vaccine development is limited by incomplete understanding of protective immunity, antigenic redundancy, and immune skewing; decolonization protocols often fail to eliminate throat colonization.
- Evident from the text: as a narrative review, it reports no systematic search strategy, inclusion/exclusion criteria, risk-of-bias assessment, or meta-analysis, so conclusions rely on cited literature and may be subject to selection bias.
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In the paper
“Despite colonizing the anterior nares, skin, and mucosal surfaces in approximately 30% of healthy individuals, S. aureus exploits breaches in host barriers or immune defenses to establish invasive infections, underscoring its adaptability and resilience [3].”
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > 1. Introduction
What the sources say
- Not checked yetcites [3] Laux, C., Peschel, A., and Krismer, B. (2019). Staphylococcus aureus Colonization of the Human Nose and Interaction with Other Microbiome Members. Microbiol. Spectr., 7. doi:10.1128/microbiolspec.gpp3-0029-2018
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In the paper
“An additional 30% undergo intermittent colonization, driven by factors such as bacterial strain adaptability, environmental exposures, and fluctuations in host immunity [11].”
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > 2. Pathogenesis of S. aureus > 2.1. Colonization Dynamics
What the sources say
- Not checked yetcites [11] Howden, 2023, Staphylococcus aureus host interactions and adaptation, Nat. Rev. Microbiol. source
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In the paper
“Specifically, S. aureus adheres to cytokeratin 10, a structural protein expressed in nasal epithelial cells, a key mechanism enabling persistent colonization [15].”
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > 2. Pathogenesis of S. aureus > 2.1. Colonization Dynamics
What the sources say
- Not checked yetcites [15] Sakr, A., Brégeon, F., Mège, J.-L., Rolain, J.-M., and Blin, O. (2018). Staphylococcus aureus Nasal Colonization: An Update on Mechanisms, Epidemiology, Risk Factors, and Subsequent Infections. Front. Microbiol., 9. source
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In the paper
“secreted toxins like α-hemolysin, Panton-Valentine leukocidin (PVL), and toxic shock syndrome toxin-1 (TSST-1) contribute to tissue destruction and systemic toxicity [5].”
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > 1. Introduction
What the sources say
- Not checked yetcites [5] Linz, M.S., Mattappallil, A., Finkel, D., and Parker, D. (2023). Clinical Impact of Staphylococcus aureus Skin and Soft Tissue Infections. Antibiotics, 12. source
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In the paper
“Persistent carriers, for instance, face elevated risks of bacteremia or surgical site infections as colonizing strains exploit breaches in immune or anatomical defenses.”
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > 2. Pathogenesis of S. aureus > 2.1. Colonization Dynamics
What the sources say
- Not checked yetcites [13] Reategui Schwarz, E., van de Guchte, A., Dupper, A.C., Caban, A.B., Nadkarni, D., Fox, L., Mills, A., Obla, A., Chacko, K.I., and Oussenko, I. (2022). Everybody nose: Molecular and clinical characteristics of nasal colonization during active methicillin-resistant Staphylococcus aureus bloodstream infection. BMC Infect. Dis., 22. doi:10.1186/s12879-022-07371-w
- Not checked yetcites [14] Gehrke, A.-K.E., Giai, C., and Gómez, M.I. (2023). Staphylococcus aureus Adaptation to the Skin in Health and Persistent/Recurrent Infections. Antibiotics, 12. doi:10.3390/antibiotics12101520
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In the paper
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > 4. Antibiotic Resistance and Mechanisms in S. aureus > 4.2. Epidemiology and Clinical Impact of MRSA
“| Africa | 2.5% | Ethiopia, Egypt | Nigeria (29%), Egypt (Multiple reports) | [222,283] |”
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > 4. Antibiotic Resistance and Mechanisms in S. aureus > 4.2. Epidemiology and Clinical Impact of MRSA
“Countries with Notable Data | Country-Specific Prevalence (%)”
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In the paper
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > 4. Antibiotic Resistance and Mechanisms in S. aureus > 4.1. Mechanisms of Antibiotic Resistance
“This growing concern culminated in a significant 1946 study by Kirby and colleagues, which documented the increasing prevalence of penicillin-resistant S. aureus in London hospitals.”
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > References
“185. Kirby W.M. Extraction of a Highly Potent Penicillin Inactivator from Penicillin Resistant Staphylococci Science 1944 99 452 453 10.1126/science.99.2579.452 17798398”
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In the paper
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > 2. Pathogenesis of S. aureus > 2.1. Colonization Dynamics
“Similarly, Marshall and Spelman previously found that 69.2% of patients tested positive in nasal samples, compared to 71.4% in throat samples.”
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > References
“62. Batra R. Eziefula A. Wyncoll D. Edgeworth J. Throat and rectal swabs may have an important role in MRSA screening of critically ill patients Intensive Care Med. 2008 34 1703 1706 10.1007/s00134-008-1153-1 18500421”
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In the paper
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > 2. Pathogenesis of S. aureus > 2.1. Colonization Dynamics
“The remaining 40% are classified as non-carriers, though transient colonization remains possible under conducive conditions, such as disrupted skin barriers or antibiotic-mediated microbiome shifts [12].”
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > 2. Pathogenesis of S. aureus > 2.1. Colonization Dynamics
“Approximately 20% of the human population are persistent carriers of S. aureus, 60% exhibit intermittent carriage, and the remaining 20% show no detectable colonization.”
Rated minor: it would not touch a result — a value no result rests on, a p-value that stays on the same side of the significance level, or a conflict that is clerical, resolved elsewhere in the paper, or outside its own findings.
In the paper
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > 4. Antibiotic Resistance and Mechanisms in S. aureus > 4.1. Mechanisms of Antibiotic Resistance
“The key breakthrough came in the late 1940s when Chain and Abraham demonstrated that resistant strains produced an enzyme capable of breaking down the antibiotic [188].”
§ Staphylococcus aureus: A Review of the Pathogenesis and Virulence Mechanisms > References
“188. Abraham E.P. Chain E. An enzyme from bacteria able to destroy penicillin. 1940 Rev. Infect. Dis. 1988 10 677 678 3055168”
Citations
Cites
Waves of resistance: Staphylococcus aureus in the antibiotic era
Chambers, H. F., & DeLeo, F. R. (2009) · Nature Reviews Microbiology · doi:10.1038/nrmicro2200 · Cited by 2,718
Antimicrobial Resistance: A Growing Serious Threat for Global Public Health
Salam, M. A., Al-Amin, M. Y., Salam, M. T., Pawar, J., Akhter, N., Rabaan, A. A., & Alqumber, M. A. A. (2023) · doi:10.20944/preprints202305.0555.v1 · Cited by 2,411
Antibiotics: past, present and future
Hutchings, M. I., Truman, A. W., & Wilkinson, B. (2019) · Current Opinion in Microbiology · doi:10.1016/j.mib.2019.10.008 · Cited by 2,370
Antimicrobial Resistance: A Growing Serious Threat for Global Public Health
Salam, M. A., Al-Amin, M. Y., Salam, M. T., Pawar, J. S., Akhter, N., Rabaan, A. A., & Alqumber, M. A. A. (2023) · Healthcare · doi:10.3390/healthcare11131946 · Cited by 2,338
Methicillin-resistant Staphylococcus aureus: an overview of basic and clinical research
Turner, N. A., Sharma-Kuinkel, B. K., Maskarinec, S. A., Eichenberger, E. M., Shah, P. P., Carugati, M., Holland, T. L., & Fowler, V. G. (2019) · Nature Reviews Microbiology · doi:10.1038/s41579-018-0147-4 · Cited by 2,051
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Multidrug Resistance in Bacteria
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Adhesion, invasion and evasion: the many functions of the surface proteins of Staphylococcus aureus
Foster, T. J., Geoghegan, J. A., Ganesh, V. K., & Höök, M. (2014) · Nature Reviews Microbiology · doi:10.1038/nrmicro3161 · Cited by 1,533
Aminoglycoside modifying enzymes
Ramirez, M. S., & Tolmasky, M. E. (2010) · Drug Resistance Updates · doi:10.1016/j.drup.2010.08.003 · Cited by 1,464
Antimicrobial resistance: the example of Staphylococcus aureus
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Research works printed but not linked: 6
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- Khetsuriani, S. (2023). Gastrointestinal Colonization by Staphylococcus aureus Strains as Risk Factor for Different Infections (Brief Review). Int. J. Multidiscip. Res. Publ. IJMRAP, 5.
- Savini, V. (2018). Chapter 9—The Staphylococcal Panton-Valentine Leukocidin (PVL). Pet-To-Man Travelling Staphylococci, Academic Press Cambridge. Available online: https://www.sciencedirect.com/science/article/pii/B9780128135471000091.
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Cited by
Papaneophytou, C. P. (2026) · Current Issues in Molecular Biology · doi:10.3390/cimb48020214 · Cited by 33
Vaccines as Potential Frontliners Against Antimicrobial Resistance (AMR): A Focused Review
Patil, S., Singh, I. P., Verma, I. K., Kumar, A., Sharma, J., Ratn, A., Dhakad, M. S., & Sharma, D. (2025) · Infection and Drug Resistance · doi:10.2147/idr.s544665 · Cited by 24
Vongmanee, N., Nampeng, J., Pintavirooj, C., & Visitsattapongse, S. (2025) · Polymers · doi:10.3390/polym17212826 · Cited by 11
Sim, M., Boya, B. R., Kim, Y., Lee, J., & Lee, J. (2025) · Microbial Biotechnology · doi:10.1111/1751-7915.70280 · Cited by 11
Zaidi, S., Srivastava, N., Goel, N., Sood, S., & Khare, S. K. (2025) · Process Biochemistry · doi:10.1016/j.procbio.2025.08.016 · Cited by 8
Metadata
- Authors
- Touaitia, R., Mairi, A., Ibrahim, N. A., Basher, N. S., Idres, T., & Touati, A.
- Affiliations
- Université Larbi Tébessi (DZ)
- University of Béjaïa (DZ)
- Imam Mohammad ibn Saud Islamic University (SA)
- Research Laboratory for Management of Local Animal Resources, Rabie Bouchama National Veterinary School of Algiers, Issad ABBAS Street, BP 161 Oued Semar, Algiers 16059, Algeria
- Corresponding author
- Ibrahim, Nasir Adam
- ORCID
- Venue
- Antibiotics
- Publisher
- MDPI AG
- Published
- 2025-05-06
- Volume
- 14
- Issue
- 5
- Pages
- 470
- ISSN
- 2079-6382 (ISSN-L)
- PMC
- PMC12108373
- OpenAlex
- W4410121808
- Semantic Scholar
- 8757827856862ba5145058005f895b8f0dfe4cef
- Cited by
- 273
- References
- 303
- Citations by year
- 2026: 207 · 2025: 66
- FWCI
- 33.52
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Antibiotics (publishedVersion, cc-by)
- PubMed (publishedVersion)
- PubMed Central (publishedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Deanship of Scientific Research at Imam Mohammad Ibn Saud Islamic University (IMSIU) (IMSIU-DDRSP2501)
- Topics
- Health Sciences › Medicine › Infectious Diseases › Antimicrobial Resistance in Staphylococcus
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bacterial biofilms and quorum sensing
- Health Sciences › Medicine › Infectious Diseases › Streptococcal Infections and Treatments
- Keywords
- Staphylococcus aureus, pathogenesis, virulence factors, biofilm formation, antibiotic resistance, methicillin-resistant Staphylococcus aureus, nasal carriage, skin colonization, oropharyngeal colonization, clfB, Panton-Valentine leukocidin, toxic shock syndrome toxin-1, iron acquisition, horizontal gene transfer, vancomycin resistance, decolonization, host-microbiome interactions, immune evasion, anti-virulence therapy, multi-epitope vaccine, AI-assisted diagnosis, antimicrobial resistance surveillance
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