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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...
Development of Antibiotic Resistance01:30

Development 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...
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...
Antibiotic Selection00:57

Antibiotic Selection

Overview
Antimicrobial Effectiveness01:28

Antimicrobial Effectiveness

The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
Microbiota Modulation by Antibiotics01:21

Microbiota Modulation by Antibiotics

Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...

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Related Experiment Video

Updated: Jun 28, 2026

Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes
08:58

Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes

Published on: March 3, 2023

Enterococcal infections & antimicrobial resistance.

Seema Sood1, Meenakshi Malhotra, B K Das

  • 1Department of Microbiology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India.

The Indian Journal of Medical Research
|November 13, 2008
PubMed
Summary
This summary is machine-generated.

Enterococci, particularly Enterococcus faecalis and E. faecium, are increasingly causing serious hospital-acquired infections. Their growing antibiotic resistance, including vancomycin-resistant enterococci (VRE), poses significant challenges for patient care.

Related Experiment Videos

Last Updated: Jun 28, 2026

Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes
08:58

Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes

Published on: March 3, 2023

Area of Science:

  • Medical Microbiology
  • Infectious Diseases
  • Hospital Epidemiology

Background:

  • Enterococci are recognized as significant nosocomial pathogens, with Enterococcus faecalis and Enterococcus faecium causing the majority of human infections.
  • These bacteria are frequently implicated in urinary tract infections, intra-abdominal infections, and bloodstream infections, often linked to instrumentation and antimicrobial use.

Purpose of the Study:

  • To review the evolving landscape of enterococcal infections, focusing on their increasing nosocomial importance.
  • To discuss the mechanisms of antimicrobial resistance, pathogenicity, and virulence factors associated with enterococci.
  • To outline current strategies for the prevention, control, and treatment of severe enterococcal infections.

Main Methods:

  • Literature review of enterococcal infections, antimicrobial resistance, and treatment strategies.
  • Analysis of epidemiological data on the prevalence and distribution of enterococcal infections.
  • Synthesis of information on virulence factors and resistance mechanisms.

Main Results:

  • Enterococci have shifted from low-grade pathogens to major causes of hospital-acquired infections.
  • Antimicrobial resistance, including the emergence of vancomycin-resistant enterococci (VRE), is a critical concern.
  • Acquisition of resistance genes via plasmids and transposons contributes to the adaptability of enterococci in healthcare settings.

Conclusions:

  • Enterococcal infections represent a growing threat in healthcare, necessitating enhanced surveillance and control measures.
  • The ability of enterococci to acquire and spread antibiotic resistance, including to other bacteria like Staphylococcus aureus, complicates treatment and patient management.
  • Effective prevention, control, and treatment strategies are crucial to combat the rising incidence and severity of enterococcal infections.