Visceral larva migrans is primarily associated with which organism?

Visceral larva migrans is primarily caused by the larval stages of Toxocara canis and Toxocara cati, which are roundworms commonly found in dogs and cats, respectively. When humans accidentally ingest the eggs of these parasites, the larvae hatch in the intestines and can migrate through various tissues, leading to the condition known as visceral larva migrans. This can result in symptoms such as fever, fatigue, and abdominal pain as the larvae move through the body, potentially affecting the liver, lungs, and other organs.

The other organisms listed are associated with different conditions. Onchocerca volvulus causes river blindness, Dracunculus medinensis is responsible for guinea worm disease, and Angiostrongylus cantonensis is known for causing eosinophilic meningitis. Each of these organisms has distinct life cycles and disease manifestations that do not align with the migratory patterns seen in visceral larva migrans, specifically tied to Toxocara species.