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.In humans, after contact with infected fecal material, the roundworm migrates throughout various organs but is unable to sexually mature. Reactive inflammatory processes lead to the organism's encapsulation. Ocular larva migrans is a result of the ingested egg developing and migrating to the eye causing local disease.
Albendazole is the treatment of choice for toxocariasis. Patients receiving a 5-day treatment course of albendazole (10 mg/kg of body weight/day in two divided doses) improved relative to patients who received treatment with the older anthelminthic drug thiabendazole .In the Mexico, about 3,858 cases of Toxocara infection are reported in humans each year. Almost 16% of the Mexico population is infected with Toxocara, a parasite of dogs and cats that can be passed from animals to humans.