Q9. Regarding ESBL-producing organisms and their treatment, which of the following statements are correct?

1. 1st generation cephalosporins such as Cefazolin retain activity against ESBL producers, unlike 3rd generation

2. Carbapenems have proven clinical efficacy against ESBL-producing organisms

3. The beta-lactamase enzyme responsible for ESBL resistance is encoded on transferable plasmids

4. Piperacillin-Tazobactam is a reliable and effective alternative to Carbapenems

1. A

   A. 1, 2, and 4 only

2. B

   B. 2, 3, and 4 only

3. C

   C. 1, 2, and 3 only

4. D

   D. 1, 2, 3, and 4 all

Appeared in: INI-CET EXAM -2026

Explanation

• Statement 2 is correct. Carbapenems like meropenem and imipenem are the standard of care and most reliable treatment for serious infections caused by ESBL-producing organisms because they are resistant to breakdown by ESBL enzymes.
• Statement 3 is correct. The genes that code for ESBL enzymes are typically located on transferable plasmids. This mobility allows resistance to spread rapidly between different bacteria, contributing to its global prevalence.
• 2 and 3 only matches the defining clue or classification criterion in the stem.
• Supporting mechanism: The option aligns with the governing rule, pattern, sequence, classification, or exam logic being tested.
• Key differentiator: It fits the one fact that separates the correct response from the closest distractor.

Why Other Options Were Wrong

• Option A: This option includes statement 1, which is false. ESBLs inactivate first-generation cephalosporins. It also includes statement 4, which is false as Piperacillin-Tazobactam is not a reliable alternative for serious ESBL infections.
• Option B: This option includes statement 4, which is incorrect. Piperacillin-Tazobactam has been shown to be inferior to carbapenems for treating serious ESBL infections, making it an unreliable alternative.
• Option D: This option claims all statements are correct, which is false. Statements 1 and 4 are factually incorrect.

Related Visual

Clinical Relevance

• Nursing practice connection: Knowing Pharmacology and Microbiology of ESBL-producing organisms helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• Understanding ESBL is critical for nurses due to its impact on patient care. Infections with ESBL-producers are associated with increased morbidity, mortality, and healthcare costs.
• Nurses play a key role in infection control by implementing contact precautions for patients with ESBL infections to prevent transmission to other patients.
• Accurate medication administration is vital. A nurse questioning an order for ceftriaxone for a patient with a known ESBL-producing E. coli infection and escalating to the pharmacist or physician demonstrates critical thinking and patient advocacy.

How to Approach the Question

• First, recognize this is a multi-statement question. Your task is to evaluate the truthfulness of each individual statement.
• Read statement 1. Recall the definition of 'Extended-Spectrum' Beta-Lactamase. It implies resistance to a wide range of cephalosporins, not just later generations. Conclude it's likely false.
• Read statement 2. Access your knowledge of antibiotic classes. Carbapenems are known as 'big guns' used for multidrug-resistant organisms. This statement is likely true.
• Read statement 3. Think about how antibiotic resistance spreads. Plasmids are the primary vehicle for horizontal gene transfer in bacteria. This statement is a core concept in microbiology and is likely true.
• Read statement 4. Consider the hierarchy of antibiotics. Is a penicillin-based combination (even with an inhibitor) as reliable as a carbapenem for a highly resistant organism? This is a point of clinical debate, but for high-stakes exams, carbapenems are superior. Mark this as likely false.
• Synthesize your findings: Statements 2 and 3 are true; 1 and 4 are false. Look for the option that contains '2 and 3 only'. If it's not present, identify the question as flawed but select the best possible choice or note the discrepancy.

Concept Tested & Keywords

• Concept Tested: Pharmacology and Microbiology of ESBL-producing organisms
• Stem keywords: ESBL-producing organisms, Carbapenems, Cephalosporins, Piperacillin-Tazobactam, plasmids
• Lead-in keywords: which of the following statements are correct
• Negative lead-in flag: false

Question ID

Q0ou_uh1-uRVie4tuwXMAJ

Copy ID

Reference Book

E6 Medicine Harrison 22e Part 1 pp. 1325-1327, 1216-1218