Toxocariasis is an infection caused by the ingestion of larvae of the dog roundworm Toxocara canis or the cat roundworm Toxocara cati. The soil of parks and playgrounds is commonly contaminated with the eggs of T canis, and infection may cause human disease that involves the liver, heart, lung, muscle, eye, and brain.The roundworm parasites responsible for toxocariasis (called Toxocara) live in the digestive system of dogs, cats and foxes. The worms produce eggs, which are released in the faeces of infected animals and contaminate soil. The eggs only become infectious after 10-21 days, so there's no immediate danger from fresh animal faeces. However, once the eggs are passed into sand or soil, they can survive for many months.
Albendazole has been used to treat millions of patients worldwide and in mass drug administration campaigns, and it is considered to be a safe drug with low toxicity record. In addition to antiparasitic therapy, symptomatic therapy including steroid treatment to control inflammation may be indicated.In the Japan, about 4,681 cases of Toxocara infection are reported in humans each year. Almost 18% of the Japan population is infected with Toxocara, a parasite of dogs and cats that can be passed from animals to humans.