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Related Concept Videos

Biofilms01:29

Biofilms

Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...
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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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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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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Gene Regulation in Microbial Communities: Quorum Sensing

Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...

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A Platform of Anti-biofilm Assays Suited to the Exploration of Natural Compound Libraries
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Published on: December 27, 2016

Effect of antibacterials on biofilms.

Saima Aslam1

  • 1Section of Infectious Diseases, Baylor College of Medicine, and Michael E. DeBakey VA Medical Center, Houston, TX 77030, USA. saslam@bcm.tmc.edu

American Journal of Infection Control
|December 17, 2008
PubMed
Summary
This summary is machine-generated.

Health care-associated bloodstream infections (BSIs) often stem from bacterial biofilms on indwelling catheters. Effective treatment requires preventing contamination, minimizing attachment, using antibiofilm agents, or device removal.

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Area of Science:

  • Medical Microbiology
  • Infectious Diseases
  • Biomedical Engineering

Background:

  • Indwelling catheters are a primary source of health care-associated bloodstream infections (BSIs).
  • Bacterial biofilms, comprising bacteria within an extracellular matrix on catheter surfaces, cause these infections.
  • Biofilm formation involves bacterial adherence, microcolony development, and matrix secretion, leading to potential bacteremia.

Purpose of the Study:

  • To review the challenges and strategies for managing biofilm-associated infections linked to indwelling catheters.
  • To highlight the limitations of systemic antibiotics against biofilm-embedded bacteria.
  • To discuss effective intervention strategies and specific antimicrobial agents for biofilm eradication.

Main Methods:

  • Literature review of biofilm formation and treatment strategies.
  • Analysis of the efficacy of various antimicrobial agents against biofilm-associated bacteria.
  • Examination of intervention methods, including prevention and device management.

Main Results:

  • Systemic antibiotics are often ineffective against biofilm-embedded bacteria, necessitating device removal.
  • Biofilm resistance is multifactorial, complicating eradication efforts.
  • Effective agents include rifampin, tigecycline, daptomycin, N-acetylcysteine, and ethanol, often used in combination or lock solutions.

Conclusions:

  • Prompt removal of infected devices is crucial for managing most biofilm-related infections.
  • Multi-faceted intervention strategies are essential, from prevention to targeted antimicrobial therapy.
  • Specific antibacterials show promise in penetrating biofilms and eliminating embedded organisms.