Which of the following statement is false about extended-spectrum beta-lactamases (ESBL)?
**Core Concept**
Extended-spectrum beta-lactamases (ESBLs) are a group of enzymes produced by certain bacteria, primarily Gram-negative rods, that confer resistance to extended-spectrum cephalosporins and penicillins. These enzymes work by hydrolyzing the beta-lactam ring of these antibiotics, rendering them ineffective.
**Why the Correct Answer is Right**
ESBLs typically target the penicillin-binding proteins (PBPs) on the bacterial cell wall, preventing the antibiotics from inhibiting bacterial cell wall synthesis. The production of ESBLs is often associated with the presence of plasmids, which can be easily transferred between bacteria, leading to the spread of antibiotic resistance. ESBL-producing bacteria are often resistant to multiple antibiotics, including cephalosporins, penicillins, and monobactams.
**Why Each Wrong Option is Incorrect**
**Option A:** This statement is actually true. ESBLs are often produced by Gram-negative bacteria such as *Escherichia coli* and *Klebsiella pneumoniae*. **Option B:** This statement is also true. ESBLs are resistant to beta-lactamase inhibitors such as clavulanic acid. **Option D:** This statement is true as well. ESBLs can be inhibited by carbapenems, which are a class of broad-spectrum beta-lactam antibiotics.
**Clinical Pearl / High-Yield Fact**
It is essential to note that ESBL-producing bacteria can be identified using specific laboratory tests, such as the ESBL test, which involves assessing the bacteria's ability to hydrolyze certain antibiotics. This information is crucial for guiding antibiotic therapy and preventing the spread of resistance.
**Correct Answer: A.**