| [frequency of seropositivity to toxocara canis in children of different socioeconomic strata]. | frequency of seropositivity for toxocara in children from different socioeconomic strata in the city of brasilia (brazil) was measured. six hundred and two children of both sexes, aged one to 12 years were distributed in two socioeconomically distinct groups. the samples of sera of the first group were obtained from blood drawn for routine tests in the laboratory of a public hospital attending children from low-income families. samples from the second group were obtained from private laboratorie ... | 2003 | 12937730 |