Related Experiment Video
Updated: Jul 5, 2026
12:18
Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)
Published on: February 9, 2011
Pathogenesis of methicillin-resistant Staphylococcus aureus infection
Rachel J Gordon1, Franklin D Lowy
1Division of Infectious Diseases, Department of Medicine, Columbia University College of Physicians and Surgeons, New York, New York, USA.
Summary
Staphylococcus aureus causes many diseases, but its virulence factors are not fully understood. This review examines pathogenic factors, particularly in methicillin-resistant S. aureus (MRSA) strains, and their role in disease.
Area of Science:
- Microbiology
- Infectious Diseases
- Pathogenesis
Background:
- Staphylococcus aureus is a adaptable pathogen causing diverse human illnesses.
- Understanding the specific roles of virulence factors in staphylococcal infections is crucial.
- Distinct clonal types exhibit varying capacities for causing global or community-acquired diseases.
Purpose of the Study:
- To review general aspects of staphylococcal pathogenesis.
- To emphasize the role of virulence factors in methicillin-resistant Staphylococcus aureus (MRSA).
- To investigate factors and genetic backgrounds that may enhance MRSA virulence or specific clinical syndromes.
Main Methods:
- Literature review of staphylococcal pathogenesis.
- Analysis of virulence factors in Staphylococcus aureus.
- Comparative examination of methicillin-resistant and methicillin-sensitive strains.
Main Results:
- Staphylococcus aureus possesses diverse virulence factors contributing to disease.
- Methicillin-resistant S. aureus (MRSA) strains do not inherently possess greater virulence than methicillin-sensitive strains.
- Specific MRSA strains may harbor unique factors or genetic traits enhancing virulence or enabling particular clinical presentations.
Conclusions:
- Virulence in Staphylococcus aureus is multifactorial and strain-dependent.
- Certain MRSA strains possess enhanced pathogenic potential due to specific genetic factors.
- Further research into these factors is essential for understanding and combating staphylococcal infections.
Related Concept Videos
01:25Mechanism of Antibiotic Resistance in MRSA
Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...
01:29Staphylococcal Skin Infections
Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
01:25Clinical Significance of Antibiotic Resistance
Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...
01:31Defense Against Bacterial Pathogens
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
01:20Determinants of Bacterial Pathogenicity and Virulence
Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...
01:30Development of Antibiotic Resistance
Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...