A 10 year old male presented to the pediatric OPD with colicky pain, nausea, vomiting. Erect abdominal Xray shows multiple air fluid levels. Stool examination shows the following egg. Which of the following interleukin is secreted in this scenario?
**Core Concept**
The scenario describes a case of intestinal obstruction due to a parasitic infection, likely caused by Ascaris lumbricoides, a type of roundworm. The infection leads to the secretion of various cytokines and chemokines by the host's immune system in response to the parasite.
**Why the Correct Answer is Right**
The correct interleukin secreted in this scenario is IL-4. IL-4 is a cytokine that plays a crucial role in the humoral immune response and is involved in the activation of eosinophils, which are essential for combating parasitic infections. The presence of the Ascaris egg in the stool triggers an immune response, leading to the secretion of IL-4, which in turn promotes the activation of eosinophils to fight off the parasite. This eosinophilic response is a characteristic feature of parasitic infections, including those caused by Ascaris lumbricoides.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because IL-1β is a pro-inflammatory cytokine involved in the innate immune response, but it is not specifically associated with parasitic infections or eosinophil activation.
**Option B:** Incorrect because IL-10 is an anti-inflammatory cytokine that regulates the immune response and is not directly involved in the fight against parasitic infections.
**Option C:** Incorrect because IL-12 is a cytokine involved in the activation of T cells and natural killer cells, but it is not specifically associated with eosinophil activation or parasitic infections.
**Clinical Pearl / High-Yield Fact**
Remember that eosinophilic responses are characteristic of parasitic infections, and the presence of eosinophils in the stool or blood can indicate a parasitic infection, such as Ascaris lumbricoides.
**Correct Answer:** D. IL-4.