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Related Concept Videos

Bacterial Gastroenteritis01:18

Bacterial Gastroenteritis

Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid receptor...
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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...
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

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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...
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Inhibitors of Gram-positive Cell Wall Synthesis

Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...
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Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...

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

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[Extended-spectrum beta-lactamase producing-enterobacteriaceae].

P Mariani-Kurkdjian1, C Doit, E Bingen

  • 1CNR associé E. coli-Shigella, Service de Microbiologie, Université Paris-Diderot, Hôpital Robert Debré, 48, boulevard Sérurier, 75935 Paris cedex 19, France.

Archives De Pediatrie : Organe Officiel De La Societe Francaise De Pediatrie
|November 27, 2012
PubMed
Summary
This summary is machine-generated.

Extended-spectrum beta-lactamases (ESBLs) are enzymes found in bacteria like E. coli, causing infections. Rising carbapenem use necessitates alternative treatments for ESBL-producing pathogens.

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Antimicrobial Resistance

Context:

  • Extended-spectrum beta-lactamases (ESBLs) are enzymes conferring resistance to penicillins and cephalosporins.
  • CTX-M, SHV, and TEM are the most prevalent ESBL families, frequently identified in Klebsiella pneumoniae and E. coli.
  • ESBL-producing E. coli infections, particularly urinary tract infections, have increased since 2000.

Purpose:

  • To highlight the growing prevalence of ESBL-producing E. coli.
  • To underscore the clinical implications of ESBLs in various infections.
  • To address the need for alternative therapies due to rising carbapenem consumption.

Summary:

  • ESBLs are mobile genes enabling bacteria to resist common antibiotics.
  • Predominantly found in E. coli, ESBLs are increasingly implicated in urinary tract infections.
  • The rise in carbapenem consumption poses a risk for the spread of carbapenem-resistant organisms.

Impact:

  • Increased incidence of ESBL-producing E. coli necessitates vigilant surveillance and infection control.
  • The study emphasizes the urgent need for alternative treatment strategies beyond carbapenems.
  • Understanding ESBL epidemiology is crucial for managing bacterial infections and antimicrobial stewardship.