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Related Concept Videos

Antibiotic Selection00:57

Antibiotic Selection

Overview
Urine Studies II: Urine Culture and Sensitivity Test01:26

Urine Studies II: Urine Culture and Sensitivity Test

A urine culture and sensitivity test is a diagnostic procedure used to identify urinary tract bacterial infections and determine the most effective antibiotics for treatment. This test is generally preferred when a patient shows manifestations of a urinary tract infection, such as frequent or painful urination, cloudy or foul-smelling urine, or lower abdominal pain.Purpose of the TestThe primary goals of a urine culture and sensitivity test are to:Determine the specific bacteria causing the...
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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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Automated diagnostic analyzers have transformed clinical microbiology by providing rapid and reliable methods for pathogen identification and antibiotic susceptibility testing. Among these systems, the Vitek 2 is widely used because it automates the traditionally labor-intensive processes of microbial identification (ID) and antibiotic susceptibility testing (AST), delivering standardized and timely results that are essential for effective patient care.Microbial Identification with ID CardsThe...
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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...

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Related Experiment Video

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Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
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Changing antibiotic sensitivity patterns at a university hospital, 1992 through 1999.

K M Chan-Tack1

  • 1Department of Medicine, University of Missouri-Columbia, 65212, USA.

Southern Medical Journal
|July 7, 2001
PubMed
Summary

Antibiotic resistance is increasing, with significant drops in bacterial susceptibility to common drugs like penicillin and aminoglycosides. This trend highlights the urgent need for comprehensive strategies to combat rising antimicrobial resistance.

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Application of the Intelligent High-Throughput Antimicrobial Sensitivity Testing/Phage Screening System and Lar Index of Antimicrobial Resistance
09:59

Application of the Intelligent High-Throughput Antimicrobial Sensitivity Testing/Phage Screening System and Lar Index of Antimicrobial Resistance

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Area of Science:

  • Medical Microbiology
  • Infectious Diseases
  • Hospital Epidemiology

Background:

  • The rise of antibiotic-resistant organisms poses a significant threat to public health.
  • Understanding local antibiotic sensitivity patterns is crucial for effective treatment.

Purpose of the Study:

  • To analyze trends in antibiotic susceptibility for key bacterial pathogens over an eight-year period.
  • To identify specific bacteria and antimicrobial agents showing decreased sensitivity.

Main Methods:

  • Retrospective review of susceptibility testing data for common hospital isolates (1992-1999).
  • Inclusion of Streptococcus pneumoniae, Enterococcus sp, Staphylococcus aureus, coagulase-negative Staphylococcus, Escherichia coli, Haemophilus influenzae, and Pseudomonas aeruginosa.
  • Compilation and analysis of microbiologic and sensitivity data.

Main Results:

  • Observed significant declines in bacterial susceptibility to various antimicrobial agents.
  • Notable decreases in Streptococcus pneumoniae sensitivity to penicillin (96% to 63%).
  • Reduced susceptibility in coagulase-negative Staphylococcus to oxacillin (50% to 38%) and Pseudomonas aeruginosa to aminoglycosides and ciprofloxacin.

Conclusions:

  • Decreased antibiotic sensitivities are linked to increased bacterial selection pressure from widespread antibiotic use.
  • A multidisciplinary approach involving infection control, infectious disease specialists, and hospital administration is essential.
  • Addressing escalating antibiotic resistance requires coordinated efforts within healthcare settings.