5 year old child with pseudomembrane in throat, fever, sore throat, organism is ?
**Core Concept**
The question describes a clinical presentation of a 5-year-old child with a pseudomembrane in the throat, fever, and sore throat. This presentation is suggestive of diphtheria, a bacterial infection caused by Corynebacterium diphtheriae. The pseudomembrane is a hallmark of this disease.
**Why the Correct Answer is Right**
Diphtheria is caused by the bacterium Corynebacterium diphtheriae, which produces a toxin that leads to the formation of a pseudomembrane in the throat. The toxin, diphtheria toxin, inhibits protein synthesis in host cells, leading to cellular damage and the characteristic pseudomembrane. The organism thrives in the presence of a weakened immune system, poor hygiene, and crowded living conditions.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because Corynebacterium diphtheriae is the causative organism of diphtheria, not Streptococcus pyogenes, which causes strep throat.
* **Option B:** This option is incorrect because Haemophilus influenzae type b (Hib) is a cause of meningitis, epiglottitis, and otitis media, but not diphtheria.
* **Option C:** This option is incorrect because Staphylococcus aureus is a common cause of skin and soft tissue infections, but not diphtheria.
* **Option D:** This option is incorrect because Candida albicans is a fungus that causes opportunistic infections, but not diphtheria.
**Clinical Pearl / High-Yield Fact**
The pseudomembrane in diphtheria is a characteristic feature that can be used to diagnose this disease. The membrane can be removed and sent for Gram staining to confirm the diagnosis.
**Correct Answer:** C. Corynebacterium diphtheriae.