Related Experiment Video
Updated: Jul 17, 2026
12:18
Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)
Published on: February 9, 2011
Methicillin-resistant Staphylococcus aureus. Epidemiologic observations during a community-acquired outbreak
Annals of Internal Medicine
|January 1, 1982
Summary
Community-acquired methicillin-resistant Staphylococcus aureus (MRSA) infections were identified in 40 patients, highlighting MRSA
Area of Science:
- Infectious Diseases
- Epidemiology
- Microbiology
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) is a significant pathogen.
- Understanding the origins and transmission of MRSA is crucial for effective control.
- Previous antimicrobial therapy is a known risk factor for MRSA infections.
Observation:
- A study in a large urban hospital from March to December 1980 identified 40 patients with community-acquired MRSA infections.
- Infections occurred in both drug abusers (24) and non-abusers (16).
- Patients with MRSA infections experienced longer hospitalizations and more frequent prior antimicrobial treatment.
Findings:
- A common phage type (29/52/80/95) was identified in 21 of 32 MRSA isolates.
- MRSA transmission from community-acquired cases into the hospital setting was observed.
- By January 1981, MRSA constituted 30.6% of nosocomial S. aureus infections at Henry Ford Hospital.
Implications:
- MRSA infections can originate in the community, not solely in hospitals.
- The findings underscore the potential for MRSA to spread within both community and healthcare settings.
- This highlights the need for comprehensive strategies to prevent MRSA dissemination.
Related Concept Videos
01:18Steps in Outbreak Investigation
In the ever-evolving field of public health, statistical analysis serves as a cornerstone for understanding and managing disease outbreaks. By leveraging various statistical tools, health professionals can predict potential outbreaks, analyze ongoing situations, and devise effective responses to mitigate impact. For that to happen, there are a few possible stages of the analysis:
01:23Investigation of Disease Outbreaks
Multistate foodborne outbreaks pose significant public health risks and require meticulous investigation to identify sources and implement control measures. The Centers for Disease Control and Prevention (CDC) utilizes a dynamic seven-step process for these investigations, integrating data from laboratories, interviews, and environmental assessments to protect public health.Outbreak Detection: The detection of multistate outbreaks typically begins with PulseNet, the CDC's national laboratory...
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...
01:25Mechanism 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...
01:25Clinical 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...