Which of the following is not true regarding enterococcus?
**Core Concept**
Enterococci are Gram-positive, facultative anaerobic bacteria that are part of the normal flora of the human gut. They are known for their ability to resist multiple antibiotics and their role in healthcare-associated infections.
**Why the Correct Answer is Right**
Enterococci are notorious for their ability to develop resistance to vancomycin, a glycopeptide antibiotic, through the acquisition of the vanA gene. This gene encodes for a modified cell wall precursor that is resistant to vancomycin. The vanA gene is often carried on a plasmid, which allows for horizontal gene transfer between bacteria. As a result, enterococci have become a significant concern in hospitals, particularly in cases of antibiotic-resistant infections.
**Why Each Wrong Option is Incorrect**
**Option A:** Enterococci are not typically associated with endocarditis, which is a common cause of morbidity and mortality in patients with pre-existing heart conditions. While they can cause infections in other parts of the body, endocarditis is more commonly associated with other types of bacteria, such as Streptococcus viridans.
**Option B:** Enterococci are capable of producing bacteriocins, which are small proteins that inhibit the growth of other bacteria. This is a true statement, but it is not the focus of the question.
**Option C:** Enterococci are not typically associated with meningitis, which is an infection of the meninges, the protective membranes surrounding the brain and spinal cord. While enterococci can cause infections in other parts of the body, meningitis is more commonly associated with other types of bacteria, such as Neisseria meningitidis.
**Clinical Pearl / High-Yield Fact**
When treating enterococcal infections, it is essential to consider the potential for antibiotic resistance, particularly with vancomycin-resistant enterococci (VRE). A high index of suspicion and prompt laboratory testing are crucial in identifying and managing these cases.
**Correct Answer: C. Enterococci are not typically associated with meningitis.**