Environmental contamination by Toxocara sp. eggs in Ribeirão Preto, São Paulo State, Brazil Contaminação ambiental por ovos de Toxocara sp. no município de Ribeirão Preto, Estado de São Paulo, Brasil

• Published in: Revista do Instituto de Medicina Tropical de São Paulo
• Main Authors: Divani Maria Capuano, Gutemberg de Melo Rocha
• Format: Article in Journal/Newspaper
• Language: English
• Published: Universidade de São Paulo (USP) 2005
• Subjects: Toxocara sp; Soil contamination; Zoonosis; Arctic medicine. Tropical medicine; RC955-962; Infectious and parasitic diseases; RC109-216; Arctic
• Online Access: https://doi.org/10.1590/S0036-46652005000400009; https://doaj.org/article/bf56f681c23b48d699a11b1d43afa614

Toxocariasis is a zoonosis mainly caused by Toxocara canis, an intestinal nematode of dogs. Man acquires the infection through accidental ingestion of viable eggs, and the toxocariasis clinical manifestations may vary from an asymptomatic infection up to the Visceral Larva Migrans syndrome. Seventy eight public squares of Ribeirão Preto, São Paulo, Brazil, including Bonfim Paulista district were visited aiming to evaluate the soil contamination by Toxocara eggs. The squares were divided in five different areas corresponding to the Sanitary Districts of the city. From May to December 2003, soil samples weighting about 250 g each were collected from five distinct sites of each public square. The laboratorial analysis was done by centrifugal-flotation techniques in magnesium sulphate solutions with 5% of potassium iodide (d = 1.33) and zinc sulphate (d = 1.20), and by the sedimentation- flotation in conic chalices with zinc sulphate (d = 1.20). Toxocara sp. eggs were found on 16 (20.5%) squares, with the lowest prevalence (12%) at the central area. From these results, it is expected that the legal authority will adopt protection measures for the city public areas, reducing thus the contamination risk by Toxocara sp. eggs. A toxocaríase é uma zoonose causada principalmente pelo Toxocara canis, nematóide intestinal de cães. O homem adquire a infecção através da ingestão acidental de ovos viáveis, sendo que as manifestações clínicas da toxocaríase podem variar desde uma infecção assintomática à síndrome da Larva Migrans Visceral. Com o objetivo de avaliar a contaminação do solo por ovos de Toxocara sp, foram visitadas 78 praças públicas de Ribeirão Preto, incluindo o distrito de Bonfim Paulista. As praças foram distribuídas em cinco áreas diferentes correspondentes as mesmas dos Distritos Sanitários do município. Entre maio a dezembro de 2003 foram coletadas de cinco pontos de cada praça amostras de solo de aproximadamente 250 gramas. A análise laboratorial foi realizada pelas técnicas da centrífugo-flutuação em ...