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Study of IgG avidity and the level of specific IgA antibodies and their significance in the diagnosis of human toxocarosis. | LitMetric

Study of IgG avidity and the level of specific IgA antibodies and their significance in the diagnosis of human toxocarosis.

Exp Parasitol

National Centre of Infectious and Parasitic Diseases, Sofia, Bulgaria; Department of Parasitology and Tropical Medicine, 1504, Sofia, 26, Yanko Sakazov Blvd, Bulgaria. Electronic address:

Published: May 2022

AI Article Synopsis

  • * The study aimed to assess the diagnostic importance of specific IgG avidity levels and the presence of anti-Toxocara IgA antibodies to differentiate between acute and chronic forms of the disease.
  • * Results showed low IgG avidity in only a few subjects and a notable presence of IgA in a larger group, suggesting that measuring IgG avidity is more valuable for determining the disease stage than the mere presence of IgA.

Article Abstract

Toxocarosis is a zoonotic disease caused by migration and subsequent localization of nematode larvae of Toxocara spp. in human organs and tissues, which is manifested with development of various non-specific clinical symptoms. Main diagnostic methods are serological and consists in proving the presence of anti-Toxocara IgG antibodies in patient's sera. In humans, anti-Toxocara IgG has been shown to persist in the serum for a long time and cannot be used to distinguish between past and recent infection. Aim of the present work is to investigate the diagnostic significance of the specific IgG avidity level, determined by an immuno enzyme test developed by us, and the presence of anti-Toxocara IgA for distinguishing between acute and chronic toxocarosis. The study included 130 patients with positive results in routine serological ELISA and Western blot tests and with clinical symptoms of visceral and ocular toxocarosis. The results revealed low IgG avidity (≤40%) in nine (7.3%) and presence of anti-Toxocara IgA antibodies in 36 (26.2%) of the subjects. Low avidity of IgG antibodies was found only in the first tests, and a presence of specific IgA for up to 9 months. The results of our study give us reason to believe that determination of the IgG avidity in toxocarosis is of greater diagnostic value than the presence of IgA to establish the stage of the disease.

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Source
http://dx.doi.org/10.1016/j.exppara.2022.108236DOI Listing

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