Antibiotic Resistance
It is one of the most promising emerging approaches to the global antibiotic resistance crisis.
Antibiotic Resistance
- Antibiotic resistance in S. pneumoniae is a growing concern.
- Penicillin Resistance: Most common mechanism is alterations in Penicillin-Binding Proteins (PBPs), which have reduced affinity for beta-lactam antibiotics. High-dose beta-lactams can often overcome intermediate resistance, but highly resist
- Macrolide Resistance: Mediated by two main mechanisms:
- erm genes: Encode for ribosomal methyltransferases that modify the ribosomal target site, preventing macrolide binding (MLS B phenotype).
- mef genes: Encode for efflux pumps that actively pump macrolides out of the bacterial cell.
Read this in Streptococcus pneumoniae: Characteristics, Pathogenesis, and Management
What our notes say
- It is one of the most promising emerging approaches to the global antibiotic resistance crisis. (EXAM: Bacteriophages, Laboratory Diagnosis, HPV & Parvovirus B19)
- Antibiotic resistance in *S. pneumoniae* is a growing concern. (Streptococcus pneumoniae: Characteristics, Pathogenesis, and Management)
- Appropriate antibiotic selection, dosing, and duration are critical to prevent the emergence and spread of antibiotic resistance. (Streptococcus pneumoniae: Characteristics, Pathogenesis, and Management)
- Antibiotics are crucial for treating bacterial infections, but the rise of antibiotic resistance poses a significant global health threat. (Microbial Metabolism, Structure, and Therapeutics)
- Transformed bacteria are selected using antibiotic resistance markers (Molecular Biology Exam Review MCQs)
- Another critical example is the development of antibiotic resistance in bacteria, where bacterial populations evolve resistance to antibiotics over time due to selective pressures. (Types of Polymorphism)
Study material on Antibiotic Resistance
- Gene Transfer
- Microbial Metabolism, Structure, and Therapeutics
- Streptococcus pneumoniae: Characteristics, Pathogenesis, and Management
- Principles of Medical Microbiology and Parasitology LAQs & SAQs
- Clinical Significance Of Bacterial Anatomy
- Bacteria
- Clinical Significance Of Bacterial Anatomy — Practice Questions
Practice questions on Antibiotic Resistance
The mechanism by which β-lactamase confers antibiotic resistance is
- Altering the target site
- Breaking down β-lactam antibiotics
- Pumping antibiotics out of the cell
- Blocking antibiotic uptake
- Usually mediated by non-specific mechanisms
Answer: B. β-lactamase enzymes cleave the β-lactam ring in penicillins and cephalosporins, inactivating these antibiotics before they can inhibit cell wall synthesis. ---
Which of the following structures contains genes for enzymes and antibiotic resistance? ---
- Plasmid
- Pilus
- Capsule
- Plasma Membrane
- None of the above
Answer: A.