Acute epiglottitis in children caused by –
**Core Concept**
Acute epiglottitis is a life-threatening medical emergency characterized by rapid onset of inflammation and edema of the epiglottis, often caused by bacterial infections. The epiglottis is a flap-like structure located at the entrance of the larynx, which separates the trachea from the esophagus.
**Why the Correct Answer is Right**
The most common cause of acute epiglottitis in children is Haemophilus influenzae type b (Hib). This bacterium produces toxins that lead to inflammation and edema of the epiglottis, which can cause airway obstruction and respiratory failure. The Hib bacterium adheres to the surface of the epiglottis through its capsule, leading to the production of pro-inflammatory cytokines and chemokines that exacerbate the inflammatory response.
**Why Each Wrong Option is Incorrect**
* **Option A:** Streptococcus pneumoniae is a common cause of bacterial infections in children, but it is not the most common cause of acute epiglottitis.
* **Option B:** Staphylococcus aureus is a common cause of skin and soft tissue infections, but it is not typically associated with acute epiglottitis.
* **Option C:** Pseudomonas aeruginosa is a common cause of respiratory infections in immunocompromised patients, but it is not typically associated with acute epiglottitis in children.
**Clinical Pearl / High-Yield Fact**
In children, acute epiglottitis often presents with a classic triad of symptoms: high fever, stridor, and drooling. It is essential to recognize these symptoms promptly and seek immediate medical attention to avoid airway obstruction and respiratory failure.
**Correct Answer:** D.