Which of the following is a periodontal pathogen
**Core Concept**
Periodontal pathogens are microorganisms that contribute to the development and progression of periodontal disease, a chronic inflammatory condition affecting the gums and bone supporting the teeth. These pathogens can cause the destruction of periodontal tissues, leading to tooth loss if left untreated.
**Why the Correct Answer is Right**
Porphyromonas gingivalis is a gram-negative anaerobic bacterium that plays a significant role in the pathogenesis of periodontal disease. It produces virulence factors, such as gingipains, which enable it to evade the host immune response and establish a persistent infection. The bacterium's ability to form biofilms on tooth surfaces allows it to colonize and multiply, leading to the production of inflammatory mediators and tissue destruction.
**Why Each Wrong Option is Incorrect**
**Option A:** Streptococcus mutans is a gram-positive bacterium primarily associated with the development of dental caries, not periodontal disease.
**Option B:** Escherichia coli is a gram-negative bacterium commonly found in the gut and urinary tract, but it is not typically associated with periodontal disease.
**Option C:** Candida albicans is a fungus that can cause oral infections, but it is not a periodontal pathogen.
**Clinical Pearl / High-Yield Fact**
Periodontal pathogens can be transmitted through saliva, mucus, and other bodily fluids, highlighting the importance of good oral hygiene practices and regular dental check-ups to prevent the spread of periodontal disease.
**Correct Answer: C. Candida albicans is a fungus that can cause oral infections, but it is not a periodontal pathogen.