Antimicrobials V β-Lactam Antibiotic Resistance Quiz
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Questions and Answers

What is the mortality rate for Carbapenem resistant Acinetobacter infections?

  • 10-30%
  • 30-80%
  • 52% (correct)
  • 20-50%

Which type of resistance mechanism involves altered targets like PBP2a for MRSA and Dala-Dlac for VRE?

  • Antibiotic inactivating enzymes
  • Altered target (correct)
  • Reduced accumulation
  • Intrinsic resistance

What is the primary function of β-lactamase enzymes in antibiotic resistance?

  • Reducing permeability
  • Increasing target binding
  • Inactivating antibiotics (correct)
  • Enhancing accumulation

Which bacterial pathogen is known to be cephalosporin resistant?

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

What is the common outcome of reduced permeability in Gram-positive bacteria?

<p>Resistance to antibiotics (B)</p> Signup and view all the answers

Which bacterial species exhibits intrinsic resistance due to low affinity PBPs that bind β-lactams 1000-fold less than other species?

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

What is the antimicrobial resistant category that Pseudomonas aeruginosa belongs to based on the given information?

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

Which antimicrobial agent is NOT listed under the Aminoglycosides category in the provided text?

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

In the context of β-Lactamase Mediated Resistance, which of the following antibiotic categories is specifically mentioned as a treatment option?

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

According to the provided information, which antibiotic category is associated with Colistin and Polymyxin B?

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

From the provided COVID-19 and Bacterial Infections text, what percentage of patients with COVID-19 were prescribed early empiric antibacterial therapy?

<p>56.6% (D)</p> Signup and view all the answers

In the context of Multi-drug resistant Enterobacteriaceae, what does MDR stand for?

<p>Multi-Drug Resistance (D)</p> Signup and view all the answers

What is the most common mechanism of -lactam resistance in Gram-negative bacteria?

<p>Antibiotic inactivating enzymes i.e. -lactamase (C)</p> Signup and view all the answers

Which enzyme is responsible for inactivating -lactam antibiotics?

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

What is the target of modified cross-linking for VRE bacteria?

<p>PBP 2a (C)</p> Signup and view all the answers

Which type of -lactamase is associated with cephalosporin resistance?

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

What is the primary effect of altered porin production and -lactamase production in Gram-negative cells?

<p>Inactivation of -lactam antibiotics (A)</p> Signup and view all the answers

Which type of -lactamase is commonly encountered with metallo substrates like IMP, VIM, NDM?

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

Why do failures of Cephalosporin therapy occur in serious infections caused by ESBL-positive bacteria?

<p>Production of broad-spectrum -lactamases (C)</p> Signup and view all the answers

Why is it not recommended to treat organisms with an inducible AmpC with a 3rd generation cephalosporin?

<p>Inducible AmpC can develop resistance to 3rd generation cephalosporins (A)</p> Signup and view all the answers

What type of resistance do Metallo--lactamases (MBLs) confer?

<p>Resistance to all antibiotics except aztreonam (A)</p> Signup and view all the answers

Which antibiotic is VIM, IMP, and NDM resistant to due to Metallo--lactamases (MBLs)?

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

What is the main characteristic of Class A Carbapenemases like KPC?

<p>They hydrolyze carbapenems (A)</p> Signup and view all the answers

How does therapy for KPC-producing organisms typically involve?

<p>Combination therapy is required (C)</p> Signup and view all the answers

What is the main impact of Metallo--lactamases (MBLs) on patient mortality?

<p>Increased mortality compared to other types of carbapenemases (C)</p> Signup and view all the answers

Where was the New Delhi Metallo--lactamase (NDM) first identified?

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

Why are undetected reservoirs of ESBLs in certain organisms concerning?

<p>They contribute to the spread of ESBLs in patient populations. (D)</p> Signup and view all the answers

What is the main reason why patients with CTX-M ESBLs have a higher risk of being affected when traveling?

<p>Presence in common food sources like beef and poultry. (B)</p> Signup and view all the answers

Why are ESBL-producing Enterobacteriaceae a concern beyond resistance to -lactams?

<p>They can develop resistance to all antibiotics. (D)</p> Signup and view all the answers

What is a characteristic of AmpC -lactamases that differentiates them from ESBLs?

<p>Resistance to older -lactamase inhibitors. (B)</p> Signup and view all the answers

Which antibiotic class shows the highest activity against ESBL-producing Enterobacteriaceae?

<p>$eta$-lactam/$eta$-lactamase inhibitor combinations (A)</p> Signup and view all the answers

What distinguishes derepressed mutants from wild-type organisms in terms of antibiotic resistance?

<p>$\beta$-lactam and aminoglycoside resistance. (C)</p> Signup and view all the answers

Which antibiotic type can induce AmpC enzymes in bacteria?

<p>$1^{ ext{st}}$, $2^{ ext{nd}}$, $3^{ ext{rd}}$ gen cephalosporins (B)</p> Signup and view all the answers

What is the significance of the promoter mutations regarding AmpC expression in bacteria?

<p>They result in overexpression of the AmpC gene (A)</p> Signup and view all the answers

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