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Clinical and Diagnostic Laboratory Immunology, May 1997, 247-251, Vol 4, No. 3
U Gross, O Keksel and ML Darde
The presence of immunoglobulin E (IgE) antibodies was determined by using
the immunosorbent-agglutination assay (ISAGA) with 611 serum samples from
patients with different clinical conditions to evaluate its value for the
serodiagnosis of acute Toxoplasma gondii infection. By analyzing 43
consecutively drawn serum samples from 10 pregnant women who seroconverted,
we could show that specific IgE antibodies seem to appear early after
infection and are usually present for less than 3 to 5 months. Therefore,
we assumed that IgE antibodies seem to be detectable only during the acute
or reactivated stage of infection. According to our studies, the IgE ISAGA
has an overall sensitivity of only 79.5%, but a specificity of 98.0%, with
positive and negative predictive values of 95.5 and 89.8%, respectively.
Detection of IgE antibodies in immunosuppressed patients with reactivation
of latent T. gondii infection correlates with disease activity. Despite
these encouraging results, one must note that IgE antibodies were not
detectable in 4 of 14 patients with very recent infection proven by
seroconversion. Therefore, detection of IgE antibodies seems to correlate
with early acute or reactivated toxoplasmosis, whereas negative IgE results
do not exclude the possibility of the acute stage of toxoplasmosis.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Value of detecting immunoglobulin E antibodies for the serological diagnosis of Toxoplasma gondii infection
Institute of Hygiene and Microbiology, University of Wurzburg, Germany. ugross@hygiene.uni-wuerzburg.de
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