An infant develops a cough and fever. The X-ray examination is suggestive of bronchopneumonia. All of the following viruses can be the causative agent except –
**Core Concept**
The question is testing the differential diagnosis of bronchopneumonia in infants, which involves identifying the causative viral agents. Bronchopneumonia is an inflammation of the lungs characterized by patchy, diffuse consolidation, often caused by viral infections in infants.
**Why the Correct Answer is Right**
Bronchopneumonia in infants can be caused by several viruses, including Respiratory Syncytial Virus (RSV), Influenza Virus, Parainfluenza Virus, and Adenovirus. These viruses primarily affect the respiratory tract and can cause severe lower respiratory tract infections, including bronchopneumonia. RSV is a leading cause of bronchopneumonia in infants, especially those under 6 months of age.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because RSV is a common cause of bronchopneumonia in infants.
* **Option B:** This option is incorrect because Influenza Virus can also cause bronchopneumonia in infants.
* **Option D:** This option is incorrect because Adenovirus can cause various respiratory tract infections, including bronchopneumonia, in infants.
**Clinical Pearl / High-Yield Fact**
RSV is a major cause of hospitalization for lower respiratory tract infections in infants, especially those under 6 months of age. It is essential to consider RSV as a potential causative agent in infants with bronchopneumonia, especially in the absence of other clear causes.
**Correct Answer:** A.