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.Toxocariasis is caused by a series of related nematode species (ascarids) that routinely infect dogs and cats throughout the world. The eggs from these ascarids are common environmental contaminants of human habitation, due largely to the fact that many kinds of dogs and cats serve as pets, while countless others run wild throughout the streets of most urban centers.
Visceral toxocariasis can be treated with antiparasitic drugs such as albendazole or mebendazole. Treatment of ocular toxocariasis is more difficult and usually consists of measures to prevent progressive damage to the eye.In the Sweden, about 330 cases of Toxocara infection are reported in humans each year. Almost 13% of the Sweden population is infected with Toxocara, a parasite of dogs and cats that can be passed from animals to humans.