“…Various investigators have realized environmental research in order to verify the presence of eggs from this parasite in such public places: Alcantara et al (1989) found Toxocara sp. eggs in canine excrement and soil samples from 23 districts of Salvador City, state of Bahia, Brazil; Campos et al (1987), reported 66.6% positivity in Goiania, state of Goiás, Brazil; Chieffi and Müller (1976), observed 60% in public places of Londrina City, state of Paraná, Brazil; Costa-Cruz et al (1994), detected 23.07% in public places of Uberlândia City, Minas Gerais, Brazil; Ferreira et al (1976), found 41.6% in the soil of public squares of Rio de Janeiro City, Rio de Janeiro, Brazil; Silva (1984) found eggs of this parasite on the ground of three public squares also in Rio de Janeiro City; and Lescano et al (1998), found 80% positivity in soil samples obtained from public squares in Lima City, Peru.…”