The prevalence of infection with intestinal helminths is decreasing in large cities of developing countries, where
sanitation has been introduced. However, infections with Toxocara spp. (T. canis and T. cati) are highly prevalent
in such environments, since they are not affected by sanitation. A decrease in the prevalence of toxocariasis depends
on the control of stray animals and antihelminthic treatment of pets to prevent the exposure of children to
this parasite, neither of which are easy to achieve