Antimicrobials VII: Antimetabolites and Nucleic Acid Inhibitors
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Questions and Answers

What is the mechanism of action of sulfonamides?

  • Inactivating bacterial enzymes
  • Disrupting cell wall formation
  • Inhibiting protein synthesis
  • Blocking folic acid synthesis (correct)
  • Why can PABA in multivitamins cause therapy failure when taking sulfonamide antibiotics?

  • It competes with sulfonamides for their target (correct)
  • It increases bacterial resistance
  • It enhances the effect of antibiotics
  • It boosts the immune system against bacteria
  • Which of the following bacterial species is not susceptible to sulfonamides?

  • E. coli
  • Staphylococcus aureus (correct)
  • Chlamydia
  • Nocardia
  • Why are sulfonamides considered antimetabolites?

    <p>They mimic metabolic substrates</p> Signup and view all the answers

    In which bacterial species would sulfonamides likely be effective due to their mechanism of action?

    <p>Escherichia coli</p> Signup and view all the answers

    When tetracycline is combined with gentamicin, what is the expected result?

    <p>Additivity</p> Signup and view all the answers

    What type of activity is exhibited when ampicillin is combined with vancomycin against E. coli?

    <p>Antagonistic</p> Signup and view all the answers

    Based on the text, what is a resistant mechanism to cell wall or membrane agents?

    <p>Modification enzymes</p> Signup and view all the answers

    In the context of phage therapy, what is the main characteristic of bacteriophages?

    <p>They infect bacteria</p> Signup and view all the answers

    What was the outcome for the pediatric patient with cystic fibrosis who received a 3-phage cocktail for a Mycobacterium abscessus infection?

    <p>Recovery to normal activities but infection not fully resolved</p> Signup and view all the answers

    How did the personalized phage treatment for a patient with P. aeruginosa prosthetic joint infection differ from standard treatment?

    <p>It combined phage treatment with synergistic antibiotics</p> Signup and view all the answers

    What is the percentage of E.coli isolates in the UK resistant to fluoroquinolones in the years 2001-2006?

    <p>20%</p> Signup and view all the answers

    Which antibiotic is cited as the first choice against Legionella pneumophila?

    <p>Moxifloxacin</p> Signup and view all the answers

    Which fluoroquinolone has been recommended by 5 ID specialists as of December 2023?

    <p>Gemifloxacin</p> Signup and view all the answers

    What condition can Clostridioides difficile infection potentially lead to?

    <p>Severe colon damage and death</p> Signup and view all the answers

    Which condition accounted for the most estimated unnecessary fluoroquinolone prescriptions in medical offices and EDs in 2014?

    <p>Colds and bronchitis</p> Signup and view all the answers

    Which pathogen has developed resistance to many fluoroquinolones?

    <p>MRSA</p> Signup and view all the answers

    What can fluoroquinolone use lead to besides resistance?

    <p>Tendon damage</p> Signup and view all the answers

    Which setting saw nearly 32 million fluoroquinolone prescriptions dispensed from U.S. outpatient pharmacies?

    <p>Medical offices and EDs</p> Signup and view all the answers

    Which statement about fluoroquinolones is true?

    <p>They are not the first-line treatment for UTIs but were the most prescribed for this condition.</p> Signup and view all the answers

    What is a common side effect associated with fluoroquinolones?

    <p>Skin rash</p> Signup and view all the answers

    What is the mechanism of action of Trimethoprim?

    <p>Blocks reduction of dihydrofolate to tetrahydrofolate</p> Signup and view all the answers

    Which antibiotic is recommended by IDSA guidance for the management of initial C.difficile episodes?

    <p>Fidaxomicin</p> Signup and view all the answers

    What is the main adverse reaction associated with Sulfonamides?

    <p>Exfoliative dermatitis</p> Signup and view all the answers

    What is the mode of action of Fidaxomicin?

    <p>Interferes with RNA polymerase</p> Signup and view all the answers

    Why should fluoroquinolones be reserved for important uses according to IDSA guidelines?

    <p>Rapid resistance development</p> Signup and view all the answers

    Which antibiotic is indicated for anaerobic or mixed intra-abdominal infections?

    <p>Metronidazole</p> Signup and view all the answers

    What is the primary target of Rifampin's mechanism of action?

    <p>Bacterial RNA polymerase</p> Signup and view all the answers

    What is the primary target for Quinolones (Q) and Fluoroquinolones (FQs)?

    <p>Type II topoisomerases</p> Signup and view all the answers

    What is the mechanism of killing associated with Aminoglycosides and Fluoroquinolones?

    <p>Inhibition of DNA synthesis</p> Signup and view all the answers

    Which enzyme is responsible for adding negative supercoils to DNA?

    <p>DNA gyrase</p> Signup and view all the answers

    What was the first plasmid-mediated Fluoroquinolone resistance reported in?

    <p>Klebsiella pneumoniae</p> Signup and view all the answers

    Which of the following is a mechanism that provides low-level protection against Fluoroquinolones?

    <p>Decreased membrane permeability</p> Signup and view all the answers

    What do multiple copies of qnr genes confer resistance to in the absence of chromosomal mutations?

    <p>Topoisomerase inhibitors</p> Signup and view all the answers

    What factor affects the resistance rates of uncomplicated ESBL positive E.coli isolates to Fluoroquinolones?

    <p>ESBL production</p> Signup and view all the answers

    Which region of the topoisomerases is associated with resistance to Quinolones and Fluoroquinolones?

    <p>'Resistance-determining' region</p> Signup and view all the answers

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