Understanding Antibiotic Resistance and Therapy Failure
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Questions and Answers

Which of the following is NOT a cause of antibiotic therapy failure?

  • Wrong dose regimen
  • Suppressed host response (correct)
  • Poor selection
  • Unjustified therapy

What is the purpose of carrying out microbial diagnosis?

  • To measure sensitivity
  • To determine resistance
  • To identify the type of bacteria (correct)
  • To ensure owner compliance

How is resistance determined using disk-diffusion method?

  • By observing the color change of the disk
  • By analyzing the genetic material of the bacteria
  • By measuring the relative diameter of inhibition (correct)
  • By counting the number of colonies

What are clinical breakpoints used for?

<p>To define resistance based on MIC values (D)</p> Signup and view all the answers

Which organization sets lab standards for antibiotic resistance testing in the US?

<p>CSLI (C)</p> Signup and view all the answers

What is the MIC value used to define resistance in the example criteria?

<p>More than 128 (A)</p> Signup and view all the answers

Which of the following is an example of intrinsic resistance?

<p>Bacteria lacking a target for a specific antibiotic (A)</p> Signup and view all the answers

What is the major mechanism of resistance for β-Lactams?

<p>Cleavage by β-lactamases (D)</p> Signup and view all the answers

Which of the following is an example of acquired resistance?

<p>Bacteria acquiring a new gene for resistance (C)</p> Signup and view all the answers

What is the role of methicillin in methicillin resistance?

<p>Binding to alternate PBP (Mec) (D)</p> Signup and view all the answers

Which of the following is NOT a common resistance mechanism for β-Lactams?

<p>Reduced permeability to the drug (C)</p> Signup and view all the answers

What is the purpose of efflux systems in bacteria?

<p>To pump drugs out and maintain a low level of the drug (C)</p> Signup and view all the answers

Which mechanism of resistance is associated with aminoglycosides?

<p>Enzymatic modification (C)</p> Signup and view all the answers

Which mechanism of resistance is associated with quinolones?

<p>Target mutations (C)</p> Signup and view all the answers

Which mechanism of resistance is associated with glycopeptides?

<p>Altered cell walls peptides (C)</p> Signup and view all the answers

Which mechanism of resistance is associated with tetracyclines?

<p>Mainly efflux (A)</p> Signup and view all the answers

Which mechanism of resistance is associated with rifamycins?

<p>Altered mutated RNA polymerase (B)</p> Signup and view all the answers

Which mechanism of resistance is associated with oxazolidinones?

<p>Mutations in 23S rRNA genes followed by gene conversion (C)</p> Signup and view all the answers

Which mechanism of resistance is associated with pleuromutilins?

<p>Ribosomal proteins preventing binding to target (D)</p> Signup and view all the answers

What is the region between MIC and MSC called?

<p>Minimum selected concentration (C)</p> Signup and view all the answers

What is the purpose of measuring sensitivity in antibiotic resistance testing?

<p>To determine the concentration of antibiotics needed to inhibit bacterial growth (A)</p> Signup and view all the answers

What is the main difference between disk-diffusion and MIC determination methods in antibiotic resistance testing?

<p>Disk-diffusion measures the relative diameter of inhibition, while MIC determination measures the antibiotic concentration (A)</p> Signup and view all the answers

What are clinical breakpoints used for in antibiotic resistance testing?

<p>To determine whether a bacteria is sensitive or resistant to a specific antibiotic (B)</p> Signup and view all the answers

Which organization sets lab standards for antibiotic resistance testing in Europe?

<p>EUCAST (B)</p> Signup and view all the answers

What is the major mechanism of resistance for β-Lactams?

<p>Target site modification (B)</p> Signup and view all the answers

What is the MIC value used to define resistance in the example criteria?

<p>Greater than 128 (B)</p> Signup and view all the answers

What is the major difference between intrinsic and acquired resistance?

<p>Intrinsic resistance is an innate ability while acquired resistance is obtained through exposure to drugs (A)</p> Signup and view all the answers

What is the main mechanism of acquired resistance by mutation and modification of the target?

<p>Mutation of target site (B)</p> Signup and view all the answers

Which group of antibiotics inhibits cell-wall synthesis?

<p>β-Lactams (D)</p> Signup and view all the answers

What is the major mechanism of resistance for β-Lactams?

<p>Cleavage by β-lactamases (A)</p> Signup and view all the answers

Which bacteria are generally resistant to cephalosporins?

<p>Enterococci (A)</p> Signup and view all the answers

What is mecA in the context of methicillin resistance?

<p>An equivalent of PBP with lower affinity for methicillin (C)</p> Signup and view all the answers

Which of the following antibiotics inhibits the formation of the 70S ribosomal complex?

<p>Oxazolidinones (B)</p> Signup and view all the answers

Which resistance mechanism is associated with mutations in the 23S rRNA genes and ribosomal proteins preventing binding to the target?

<p>Mutations in the 23S rRNA genes (A)</p> Signup and view all the answers

Which term is used to describe strains that are resistant to up to three clinical antimicrobial categories, but still have usable options?

<p>MDR (A)</p> Signup and view all the answers

Which resistance mechanism is associated with altered cell wall peptides and efflux?

<p>Altered cell wall peptides (C)</p> Signup and view all the answers

Which factor increases the risk of selection for resistance?

<p>Length of selected levels (B)</p> Signup and view all the answers

Which resistance mechanism is associated with enzymatic modification, efflux, and ribosomal mutations?

<p>Efflux (B)</p> Signup and view all the answers

Which antibiotic inhibits transcription by targeting the RNA polymerase?

<p>Rifamycins (D)</p> Signup and view all the answers

Which antibiotic should be administered using the highest possible doses to achieve concentration-dependent killing?

<p>Aminoglycosides (D)</p> Signup and view all the answers

Which one of these is a cause of antibiotic therapy failure?

<p>Unjustified therapy (B)</p> Signup and view all the answers

What is the purpose of conducting culture and antibiotic sensitivity testing?

<p>To determine the resistance profile (D)</p> Signup and view all the answers

How is resistance determined using disk-diffusion method?

<p>By measuring the relative diameter of inhibition (A)</p> Signup and view all the answers

Which type of resistance occurs when a microorganism obtains the ability to resist the activity of a new drug?

<p>Acquired resistance (A)</p> Signup and view all the answers

Which of the following is an example of intrinsic resistance?

<p>Poor permeability due to outer membrane (A)</p> Signup and view all the answers

Which resistance mechanism is associated with alteration of the drug, alteration of the target site, and efflux systems?

<p>Efflux systems (C)</p> Signup and view all the answers

Which antibiotic inhibits cell-wall synthesis?

<p>Glycopeptides (A)</p> Signup and view all the answers

What is the purpose of good antibiotic stewardship?

<p>To limit the use of antibiotics only when necessary (C)</p> Signup and view all the answers

Which term is used to describe strains that are resistant to all antimicrobial agents listed?

<p>PDR (C)</p> Signup and view all the answers

What is the region between MIC and MSC called?

<p>Minimum selected concentration (C)</p> Signup and view all the answers

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