A 10-year-old child presents with fever since 24 hours. History reveals 3 episodes of chest infection and passage of bulky, foul smelling stools. The most probable diagnosis is?
**Core Concept**
The child's presentation suggests a chronic condition affecting the respiratory and gastrointestinal systems, pointing towards a systemic disease characterized by impaired immunity and recurrent infections.
**Why the Correct Answer is Right**
The child's symptoms, including recurrent chest infections and bulky, foul-smelling stools, are indicative of Cystic Fibrosis (CF). CF is a genetic disorder caused by mutations in the CFTR gene, leading to abnormal chloride transport across epithelial cells. This results in thick, sticky mucus accumulation in the lungs and pancreas, impairing respiratory function and pancreatic enzyme secretion. The malabsorption of fats and fat-soluble vitamins in CF leads to the characteristic bulky, foul-smelling stools.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not account for the chronic nature of the symptoms or the specific combination of respiratory and gastrointestinal manifestations.
**Option B:** This option is incorrect as it does not consider the genetic basis of the disease or the characteristic pulmonary and pancreatic involvement.
**Option C:** This option is incorrect as it does not explain the recurrent infections or the specific symptoms related to malabsorption.
**Clinical Pearl / High-Yield Fact**
Cystic Fibrosis is a classic example of a genetic disorder with a significant impact on respiratory and gastrointestinal function, highlighting the importance of a thorough family history and genetic screening in the diagnosis of such cases.
**Correct Answer: D. Cystic Fibrosis**