An infant develops cough and fever. Chest X-ray is suggestive of broncho-pneumonia. All of the following viruses can be the causative agents except:
**Core Concept**
Broncho-pneumonia in infants can be caused by various viral and bacterial pathogens. The clinical presentation, including cough and fever, in conjunction with a suggestive chest X-ray, is indicative of a respiratory infection. In infants, viral infections are a common cause of broncho-pneumonia.
**Why the Correct Answer is Right**
The most common viral causes of broncho-pneumonia in infants include Respiratory Syncytial Virus (RSV), Influenza Virus, and Human Metapneumovirus. These viruses can cause severe respiratory illness, including broncho-pneumonia, in this age group. The pathophysiology involves viral replication and inflammation in the airways, leading to symptoms such as cough, fever, and difficulty breathing.
**Why Each Wrong Option is Incorrect**
**Option A:** While RSV is a common cause of broncho-pneumonia in infants, it is not the only viral agent that can cause the condition. Therefore, this option is incorrect because it implies exclusivity.
**Option B:** Influenza Virus can cause severe respiratory illness, including broncho-pneumonia, in infants. Thus, this option is incorrect because it is a correct causative agent.
**Option D:** This option is intentionally left blank to allow for the correct answer to be identified.
**Clinical Pearl / High-Yield Fact**
When evaluating an infant with cough and fever, it is essential to consider the possibility of viral broncho-pneumonia, particularly if the chest X-ray is suggestive of the condition. In such cases, prompt recognition and management are crucial to prevent complications and ensure optimal outcomes.
**Correct Answer: A.**