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Related Concept Videos

Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism 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...
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...
Staphylococcal Skin Infections01:29

Staphylococcal 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...
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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Carrier-Mediated Transport01:06

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Related Experiment Video

Updated: Jun 17, 2026

Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
14:04

Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria

Published on: May 8, 2013

[A study on the active efflux system in methicillin-resistant Staphylococcus aureus].

Xiao-lan Gao1, Bao Liu, Kui Jin

  • 1Intensive Care Unit, Anhui Province Hospital, Affiliated to Anhui Medical University, Hefei 230032, Anhui, China.

Zhongguo Wei Zhong Bing Ji Jiu Yi Xue = Chinese Critical Care Medicine = Zhongguo Weizhongbing Jijiuyixue
|January 1, 2010
PubMed
Summary

Methicillin-resistant Staphylococcus aureus (MRSA) infections are a serious concern in intensive care units (ICUs). This study found that MRSA is multi-drug resistant and possesses active efflux genes, which can be inhibited by omeprazole.

Related Experiment Videos

Last Updated: Jun 17, 2026

Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
14:04

Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria

Published on: May 8, 2013

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Pharmacology

Context:

  • Intensive care units (ICUs) are high-risk environments for healthcare-associated infections.
  • Methicillin-resistant Staphylococcus aureus (MRSA) is a significant pathogen contributing to ICU morbidity and mortality.
  • Understanding the mechanisms of antibiotic resistance in MRSA is crucial for effective treatment strategies.

Purpose:

  • To determine the prevalence of MRSA in an ICU setting.
  • To investigate the genetic basis of active efflux mechanisms in clinical MRSA isolates.
  • To evaluate the potential of omeprazole in overcoming MRSA antibiotic resistance.

Summary:

  • A high detection rate of MRSA (78.4%) was observed in the ICU.
  • The study identified the presence of active efflux genes (norA, qacA, qacB, and qacJ) in MRSA isolates.
  • Omeprazole demonstrated the ability to inhibit these efflux genes and reduce the minimal inhibitory concentration (MIC) of certain antibiotics, like levofloxacin.

Impact:

  • The findings highlight the critical issue of MRSA infections and multi-drug resistance in ICUs.
  • Identifying active efflux genes provides insight into MRSA's resistance mechanisms.
  • Omeprazole shows promise as an adjuvant therapy to enhance antibiotic efficacy against resistant MRSA strains.