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Updated: Aug 5, 2025
Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus MRSA
Published on: February 9, 2011
Clinical Impact of Staphylococcus aureus Skin and Soft Tissue Infections
Matthew S Linz1, Arun Mattappallil2, Diana Finkel3
1Department of Pathology, Immunology and Laboratory Medicine, Center for Immunity and Inflammation, Rutgers New Jersey Medical School, Newark, NJ 07103, USA.
Abstract:
The pathogenic bacterium Staphylococcus aureus is the most common pathogen isolated in skin-and-soft-tissue infections (SSTIs) in the United States. Most S. aureus SSTIs are caused by the epidemic clone USA300 in the USA. These infections can be serious; in 2019, SSTIs with S. aureus were associated with an all-cause, age-standardized mortality rate of 0.5 globally. Clinical presentations of S. aureus SSTIs vary from superficial infections with local symptoms to monomicrobial necrotizing fasciitis, which can cause systemic manifestations and may lead to serious complications or death. In order to cause skin infections, S. aureus employs a host of virulence factors including cytolytic proteins, superantigenic factors, cell wall-anchored proteins, and molecules used for immune evasion. The immune response to S. aureus SSTIs involves initial responders such as keratinocytes and neutrophils, which are supported by dendritic cells and T-lymphocytes later during infection. Treatment for S. aureus SSTIs is usually oral therapy, with parenteral therapy reserved for severe presentations; it ranges from cephalosporins and penicillin agents such as oxacillin, which is generally used for methicillin-sensitive S. aureus (MSSA), to vancomycin for methicillin-resistant S. aureus (MRSA). Treatment challenges include adverse effects, risk for Clostridioides difficile infection, and potential for antibiotic resistance.
Insights
Staphylococcus aureus causes common skin infections in the US, often severe and sometimes fatal. Treatment involves antibiotics, but challenges like resistance and side effects persist.
Area of Science:
- Microbiology
- Infectious Diseases
- Dermatology
Background:
- *Staphylococcus aureus* is a leading cause of skin-and-soft-tissue infections (SSTIs) in the United States.
- *S. aureus* SSTIs, particularly those caused by the USA300 clone, can lead to severe complications and mortality.
- Infections range from superficial to necrotizing fasciitis, involving various virulence factors and host immune responses.
Purpose of the Study:
- To review the epidemiology, clinical presentations, pathogenesis, and treatment of *Staphylococcus aureus* SSTIs.
- To highlight the role of virulence factors and the immune response in *S. aureus* pathogenesis.
- To discuss current treatment strategies and associated challenges for *S. aureus* SSTIs.
Main Methods:
- Literature review of *Staphylococcus aureus* SSTIs.
- Analysis of epidemiological data and clinical presentations.
- Summary of virulence factors, immune mechanisms, and therapeutic approaches.
Main Results:
- *S. aureus* is the primary pathogen in US SSTIs, with USA300 being a dominant clone.
- Infections present diversely, from localized symptoms to systemic illness with significant mortality risk.
- Virulence factors and host immune responses are critical in disease development.
Conclusions:
- *Staphylococcus aureus* SSTIs represent a significant public health concern due to their prevalence and potential severity.
- Understanding virulence factors and host immunity is crucial for effective management.
- Antibiotic therapy, while standard, faces challenges including resistance and adverse effects, necessitating ongoing research and careful treatment selection.
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