With reference to bacteriodes fragilis, the following statements are true, EXCEPT:
**Core Concept**
Bacteroides fragilis is an anaerobic Gram-negative bacillus commonly found in the human gut. It is a major inhabitant of the normal intestinal flora and is known for its role in various infections, particularly those involving the abdominal cavity.
**Why the Correct Answer is Right**
The correct answer is likely to be related to the characteristics or behaviors of Bacteroides fragilis. This bacterium is known for its ability to produce beta-lactamase, which confers resistance to penicillin and other beta-lactam antibiotics. Additionally, Bacteroides fragilis is often associated with polymicrobial infections, particularly in the setting of abdominal surgery or trauma. The bacterium's ability to adhere to host tissues and evade the immune system contributes to its pathogenicity.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option may be incorrect because Bacteroides fragilis is indeed a Gram-negative bacillus, but this fact is not particularly notable or relevant to its clinical significance.
* **Option B:** This option may be incorrect because Bacteroides fragilis is indeed an anaerobe, but this characteristic is not unique to this bacterium and is not particularly relevant to its clinical significance.
* **Option C:** This option may be incorrect because the statement is actually true - Bacteroides fragilis does produce beta-lactamase and is resistant to penicillin and other beta-lactam antibiotics.
**Clinical Pearl / High-Yield Fact**
In the context of abdominal surgery or trauma, Bacteroides fragilis is often a key player in polymicrobial infections. This bacterium's ability to produce beta-lactamase and evade the immune system makes it a significant challenge to treat.
**Correct Answer: C. Bacteroides fragilis is susceptible to beta-lactam antibiotics.**