Sobre a presença de ovos de Toxocara em praças da cidade do Rio de Janeiro

Abstract

Os autores estudaram a freqüência de contaminação do solo de praças da cidade do Rio de Janeiro, por ovos de Toxocara. De 24 praças examinadas encontraram 10 (41,6%) positivas. Chamam a atenção para a sua possibilidade na disseminação da "Larva Migrans Visceralis" em nosso meio.

Influence of variables on centrifuge-flotation technique for recovery of Toxocara canis eggs from soil

“…Sodium hydroxide was used in order to promoting the stickiness of eggs 13,29 . Distilled water was used in washing process of soil 3,9,23,33 .…”

“…This procedure was adopted in some studies 2,12,13,23,29,31,33 , but, on the other hand, it was disregarded by some authors 4,5,10,14,26 . This exemplifies the variety of techniques that has been used to evaluate the contamination of soil in public places.…”

“…In order to improve the recovery of eggs in soil samples diverse authors carried out trials adopting specific gravity higher than 1.20 for flotation solutions: magnesium sulfate 5 , sodium dichromate 22,26,29 , sodium nitrate 11,13,31 , and zinc sulfate 15 . In this study, there were no differences when the solutions were used in different specific gravities of 1.20, 1.25 and 1.30 g/cm 3 .…”

Human toxocariasis: contribution by Brazilian researchers

“…Frequency of human infection by Toxocara: Since the 1970s, it has been established that the essential factors for the occurrence of human infection by Toxocara and, consequently by VLM, are present in Brazil: a large number of dogs, mainly strays, infected with T. canis and frequent soil contamination by eggs of this ascarid 24,25,44 . However, only one decade later, reports on Toxocara human infection began to appear 28 and from the 1990s onward, several papers had been published reporting the presence of human infection in many Brazilian regions, with variable infection rates ( Table 2).…”

Human toxocariasis: a seroepidemiological survey in schoolchildren of Sorocaba, Brazil

“…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.…”