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Related Concept Videos

Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

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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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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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Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
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Updated: Mar 19, 2026

Antimicrobial Synergy Testing by the Inkjet Printer-assisted Automated Checkerboard Array and the Manual Time-kill Method
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[Colistin in the post-antibiotic era].

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    This summary is machine-generated.

    Colistin is crucial for treating extensively drug-resistant gram-negative bacterial infections. Despite improved safety and dosing guidance, its efficacy in combination therapy remains unproven.

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    Area of Science:

    • Microbiology
    • Infectious Diseases
    • Pharmacology

    Background:

    • Colistin resurgence in the post-antibiotic era for extensively drug-resistant (XDR) gram-negative bacteria.
    • Effective against key pathogens like Acinetobacter baumannii, Pseudomonas aeruginosa, and Klebsiella pneumoniae.
    • Improved safety and management have reduced toxicity, but confusion persists regarding dosing and nomenclature.

    Purpose of the Study:

    • To address confusion surrounding colistin's dosage, name, and labeling.
    • To highlight the need for standardized language for this polymyxin antibiotic.
    • To underscore the lack of pharmacokinetic/pharmacodynamic (PK/PD) studies and evaluate combination therapy efficacy.

    Main Methods:

    • Review of current literature on colistin use in XDR gram-negative infections.
    • Analysis of expert recommendations for colistin nomenclature and dosing.
    • Examination of evidence regarding colistin's efficacy, particularly in combination therapy.

    Main Results:

    • Colistin remains vital for treating XDR gram-negative infections.
    • Standardized language and clear dosing guidelines are recommended due to persistent confusion.
    • Pharmacokinetic/pharmacodynamic (PK/PD) data for colistin are notably lacking.
    • The efficacy of colistin in combination with other agents in reducing mortality has not been demonstrated.

    Conclusions:

    • Colistin is a critical antibiotic for XDR gram-negative bacterial infections.
    • Standardization of colistin's name, labeling, and dosing is essential.
    • Further PK/PD research is needed, and the benefit of colistin combination therapy requires more evidence.