Which worm causes myocarditis –
**Core Concept**
The question is testing knowledge of parasitology, specifically the relationship between certain worms and their potential to cause myocarditis, an inflammation of the heart muscle. This condition can result from various infectious agents, including parasites. **Toxocara** and **Trichinella** are two parasites known to affect the heart.
**Why the Correct Answer is Right**
Trichinella spiralis, the parasite responsible for trichinosis, can cause myocarditis as part of its infection process. When **Trichinella** larvae migrate through the body, they can embed in the heart muscle, leading to an inflammatory response. This is a critical aspect of the disease's pathophysiology.
**Why Each Wrong Option is Incorrect**
**Option A:** Toxocara can cause visceral larva migrans and ocular larva migrans but is less commonly associated with myocarditis compared to Trichinella.
**Option C:** and **Option D:** are not typically associated with myocarditis.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **Trichinella spiralis** infection is usually acquired through eating undercooked pork containing the larvae, making it a significant public health concern.
**Correct Answer:** D. Trichinella.