Toxocariasis is caused by migration of the larvae of Toxocara canis (dog roundworm) and less frequently of T. cati (cat roundworm) through the human tissues. Toxocara are nematode parasites of animals.Toxocariasis is infection of people and animals with intestinal roundworms from dogs (Toxocara canis) and cats (Toxocara cati). Toxocara roundworms can infect dogs and cats of all ages, but infection is particularly common in young puppies and kittens. Most animals show no signs of illness but some may have diarrhea.
The use of these drugs is unproven in the case of ocular toxocariasis. There is some support for the use of albendazole or thiabendazole to eradicate the organism. Albendazole is the preference of some physicians as it has increased blood brain barrier penetration.In the United States, about 10,000 cases of Toxocara infection are reported in humans each year. Almost 14% of the US population is infected with Toxocara, a parasite of dogs and cats that can be passed from animals to humans.