Diagnosis of human toxoplasmosis by a Dot enzyme-linked immunosorbent assay

Rev Inst Med Trop Sao Paulo. 1995 Mar-Apr;37(2):117-22. doi: 10.1590/s0036-46651995000200005.

Abstract

A Dot enzyme-linked immunosorbent assay (Dot-ELISA) was standardized and evaluated for the serodiagnosis of human toxoplasmosis. Out of 538 serum samples tested by the immunofluorescence test for toxoplasmosis (IFAT-IgG) as reference test, 183 (34%) were positive at cut off 1:16 and 192 (36%) were positive for Dot-ELISA-IgG at cut-off 1:256. For Dot-ELISA, co-positivity was 0.94, co-negativity 0.94 and concordance 0.88 in relation to IFAT-IgG. These results suggest the usefulness of Dot-ELISA (cut-off titer of 1:256) for the serodiagnosis of human toxoplasmosis. The main advantage of this technique is simplicity, positive test can be visually identified (colored precipitate). It does not require a special equipment and it can be used as a qualitative test to screen large numbers of samples or as a quantitative assay to determine end-point titration of individual sera.

Publication types

  • Clinical Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antibodies, Protozoan / blood*
  • Enzyme-Linked Immunosorbent Assay / methods*
  • Humans
  • Immunoglobulin G / blood
  • Immunoglobulin M / blood
  • Serologic Tests
  • Toxoplasmosis / blood
  • Toxoplasmosis / diagnosis*

Substances

  • Antibodies, Protozoan
  • Immunoglobulin G
  • Immunoglobulin M