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Related Concept Videos

Development of Antibiotic Resistance01:30

Development of Antibiotic Resistance

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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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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...
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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...
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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...
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Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These...
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Related Experiment Video

Updated: Apr 12, 2026

A Protocol to Characterize the Morphological Changes of Clostridium difficile in Response to Antibiotic Treatment
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Update on antimicrobial resistance in Clostridium difficile.

Qiong Gao1, Hai-hui Huang1

  • 1Institute of Antibiotics, Huashan Hospital, Fudan University, Key Laboratory of Clinical Pharmacology of Antibiotics, Ministry of Health, Shanghai 200040, China.

Yi Chuan = Hereditas
|May 23, 2015
PubMed
Summary

Clostridium difficile infections are rising, with increasing antimicrobial resistance complicating treatment. This review examines resistance patterns and mechanisms to inform future strategies against this common healthcare-associated diarrhea pathogen.

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Antimicrobial Resistance

Background:

  • Clostridium difficile is a primary cause of healthcare-associated diarrhea.
  • Significant increases in morbidity and mortality rates of C. difficile infection (CDI) have been observed globally since 2002.
  • Emerging multidrug-resistant strains complicate prevention and treatment of CDI.

Purpose of the Study:

  • To provide an updated review of antimicrobial susceptibility patterns and resistance mechanisms in Clostridium difficile.
  • To highlight the challenges posed by increasing resistance to key antibiotics.
  • To inform strategies for combating Clostridium difficile infections.

Main Methods:

  • Review of existing literature on Clostridium difficile antimicrobial resistance.
  • Analysis of susceptibility patterns for various antimicrobial agents.
  • Examination of known and suspected resistance mechanisms.

Main Results:

  • While metronidazole and vancomycin remain primary treatments, heteroresistance to metronidazole and rising vancomycin minimum inhibitory concentrations (MICs) are concerns.
  • Resistance to erythromycin and moxifloxacin varies geographically.
  • Target alteration is the primary mechanism for resistance to erythromycin, fluoroquinolones, and rifamycins.

Conclusions:

  • Antimicrobial resistance in Clostridium difficile is a growing public health concern.
  • Understanding resistance mechanisms is crucial for developing effective therapies.
  • Continued surveillance of susceptibility patterns is essential for guiding treatment decisions.