SciELO - Scientific Electronic Library Online

vol.64 issue1Etiology of fetal and neonatal death is multifactorial author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




  • Have no cited articlesCited by SciELO

Related links

  • Have no similar articlesSimilars in SciELO


Anales de la Facultad de Medicina

Print version ISSN 1025-5583


ESPINOZA, Yrma et al. ELISA technique standardisation for  human toxocariasis diagnosis. An. Fac. med. [online]. 2003, vol.64, n.1, pp.7-12. ISSN 1025-5583.

Objective: To standardise ELISA technique for Toxocara canis human infection diagnosis by using excreted-secreted antigen prepared in our country. Material and Methods: T. canis eggs were collected by incubation with formalin (2%) at 28°C in order to obtain third stage larvae that were freed and incubated in RPMI at 37°C for 7 days; the medium was replaced by a similar one and stored at -20°C. Antigen was concentrated and protein dosage was made. Sera from patients with toxocariasis and newborns were used as positive and negative controls by ELISA technique, dilutions ¼ to 1/1024. Polystyrene plates were sensitised with antigen in several concentrations and conjugated peroxidase with horseradish IgG, anti human IgG and substrate OPD were used. Absorbance was read with spectrophotometer (Multiskan plus labsystems) at 492 nm. Cut off point was determined by negative sera absorbencies arithmetic mean plus 3 standard deviations. Results: Antigen concentration was 50 ug/mL, sera dilution 1/128, conjugate dilution 1/1000 with optical density above 0,241. Conclusions: ELISA technique for serologic diagnosis of human infection by Toxocara canis could be used in epidemiological studies in our country. Its efficacy will be determined in future studies.

Keywords : Toxocara canis; toxocariasis; serology; enzyme-linked inmunosorbent essay.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )