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Related Concept Videos

Clinical Significance of Antibiotic Resistance01:25

Clinical 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...
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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...
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Related Experiment Video

Updated: Jul 10, 2026

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)
12:18

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)

Published on: February 9, 2011

MRSA case studies.

Kurt D Reed1, Mary E Stemper, Sanjay K Shukla

  • 1Emerging Infectious Disease Laboratory, Marshfield Clinic Research Foundation, Marshfield, WI, USA.

Methods in Molecular Biology (Clifton, N.J.)
|November 21, 2007
PubMed
Summary
This summary is machine-generated.

Staphylococcus aureus, including methicillin-resistant strains (MRSA), shows significant genetic diversity. Various virulence factor combinations explain the range of human infections caused by this versatile pathogen.

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Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat
07:46

Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat

Published on: June 4, 2012

Related Experiment Videos

Last Updated: Jul 10, 2026

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)
12:18

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)

Published on: February 9, 2011

Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat
07:46

Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat

Published on: June 4, 2012

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Genetics

Background:

  • Staphylococcus aureus is a adaptable pathogen causing various human infections.
  • Methicillin-resistant S. aureus (MRSA) has been a major nosocomial pathogen for over 30 years.
  • Emerging community-associated MRSA strains present a global public health challenge.

Observation:

  • Four case histories (3 MRSA, 1 methicillin-sensitive S. aureus) illustrate diverse clinical presentations.
  • Molecular characterization reveals significant genetic diversity among MRSA and sensitive strains.
  • Virulence gene profiles vary considerably among different S. aureus strains.

Findings:

  • Genetic factors underlying S. aureus virulence are increasingly understood.
  • Significant genetic diversity exists within both MRSA and methicillin-sensitive S. aureus populations.
  • Different combinations of virulence factors contribute to the spectrum of S. aureus disease.

Implications:

  • Understanding virulence determinants can inform rational prevention and control strategies for S. aureus infections.
  • The genetic variability of S. aureus necessitates adaptable approaches to infection management.
  • Further research into molecular virulence mechanisms is crucial for public health.