Related Experiment Video
Updated: Jun 26, 2026
Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
Published on: May 8, 2013
Methicillin-resistant Staphylococcus aureus infections
1The Johns Hopkins University School of Medicine, Baltimore, MD, USA.
Abstract:
Community-acquired methicillin-resistant Staphylococcus aureus (MRSA) infection is epidemic in the community, differs from nosocomial MRSA in virulence, mechanisms, and antibiotic susceptibility, and exhibits diverse and often unique pathologic characteristics. The community-acquired MRSA USA 300 strains are transmitted largely by person-to-person contact and cause characteristic soft-tissue abscesses and, less commonly, other sometimes unusual and serious infections including a necrotizing pneumonia, and other necrotic infections such as necrotizing fasciitis, pelvic thrombophlebitis, and septic phlebitis. This MRSA 300 family remains susceptible to drugs active against nosocomial MRSA (ie, vancomycin, linezolid, daptomycin) and is often susceptible to trimethoprim-sulfamethoxazole, doxycycline, and clindamycin. Recent epidemiologic data indicate that nosocomial MRSA (eg, mainly USA 100) strains are also present in the community and that MRSA USA 300 strains are present in hospital settings, with both families found in intermediate frequency in health care-associated settings (eg, nursing homes, dialysis centers). More work is needed to identify effective barrier precautions to limit their spread.
Insights
Community-acquired methicillin-resistant Staphylococcus aureus (MRSA) is a growing threat, causing distinct infections. Understanding its transmission and susceptibility is key to controlling this epidemic strain.
Area of Science:
- Infectious Diseases
- Microbiology
- Public Health
Background:
- Community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) presents unique challenges distinct from hospital-acquired strains.
- The USA 300 strains are a prevalent cause of CA-MRSA infections.
Purpose of the Study:
- To characterize the epidemiology, clinical manifestations, and antibiotic susceptibility of community-acquired MRSA (CA-MRSA).
- To differentiate CA-MRSA from nosocomial MRSA in terms of virulence and pathology.
Main Methods:
- Review of recent epidemiologic data and clinical case studies.
- Analysis of antibiotic susceptibility patterns for prevalent MRSA strains.
Main Results:
- CA-MRSA USA 300 strains exhibit distinct virulence and cause characteristic soft-tissue abscesses, necrotizing pneumonia, and other severe necrotic infections.
- CA-MRSA USA 300 remains susceptible to vancomycin, linezolid, daptomycin, trimethoprim-sulfamethoxazole, doxycycline, and clindamycin.
- Both CA-MRSA and nosocomial MRSA strains are increasingly found in community and healthcare-associated settings.
Conclusions:
- Effective barrier precautions are needed to limit the spread of CA-MRSA.
- Further research is required to understand and mitigate the impact of CA-MRSA.
Related Concept Videos
01:25Clinical Significance of Antibiotic Resistance
01:25Mechanism of Antibiotic Resistance in MRSA
01:29Staphylococcal Skin Infections
01:31Defense Against Bacterial Pathogens
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...
01:30Development of Antibiotic Resistance
01:26Healthcare Associated Infections I: Iatrogenic, Exogenic and Endogenic
HAIs significantly increase the cost of health care. Extended stays in healthcare institutions, increased disability, increased costs of medications, including specialized antibiotics, and prolonged recovery times add to the patient's expenses and the healthcare institution and funding bodies. Common...