The parasitic cause of uveitis and Visceral larva migrans is:
**Core Concept**
The question is testing the student's knowledge of ocular manifestations of parasitic infections. Toxocara cati and Toxocara canis are the causative agents of visceral larva migrans (VLM) and ocular toxocariasis, which can lead to uveitis.
**Why the Correct Answer is Right**
Toxocara cati and Toxocara canis are roundworms that can infect humans, particularly children, through fecal-oral transmission. The larvae of these parasites can migrate through various tissues, including the eyes, causing inflammation and damage. The ocular manifestations of toxocariasis include uveitis, retinal granulomas, and vision loss. The immune response to the parasite can lead to granuloma formation, which can cause scarring and vision problems.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the causative agent of ocular toxocariasis is not a protozoan.
* **Option B:** This option is incorrect because the causative agent of ocular toxocariasis is not a fungal infection.
* **Option D:** This option is incorrect because the causative agent of ocular toxocariasis is not a bacterial infection.
**Clinical Pearl / High-Yield Fact**
The diagnosis of ocular toxocariasis can be challenging, but it is essential to consider this condition in patients with uveitis and a history of exposure to cats or dogs. A history of visceral larva migrans or eosinophilia can also support the diagnosis.
**Correct Answer: C. Toxocara cati and Toxocara canis.**