Contamination of public parks in Presidente Prudente (São Paulo, Brazil) by Toxocara spp. eggs

Abstract

This study aims to evaluate soil contamination by Toxocaraspp. eggs in public parks in Presidente Prudente, São Paulo, Brazil. Soil samples (500 g) were collected every month over a 12-month period, from 25 parks in different parts of the city (northern, southern, eastern, western and central areas). Two 10-g aliquots of the material collected from each park were subjected to the centrifuge-flotation method to recover Toxocaraspp. eggs. Twenty-four out of the 25 squares studied (96.0%) were contaminated and the number of eggs recovered ranged from 1 to 398 per sample. Eggs were recovered all over the year. Despite the number being greater in autumn (p < 0.001), there was no correlation between number egg number and average monthly temperature (r=-0.492; p=0.148) or between egg number and monthly rainfall (r=-0.299; p=0.402). Park localization does not influence egg presence (p=0.7116). Because of the high level of contamination of the parks by Toxocaraspp. eggs, prevention of contamination of public areas by larva migrans agents is indicated.