Journal Article

Congenital Toxoplasmosis: Evaluation of Molecular and Serological Methods for Achieving Economic and Early Diagnosis Among Egyptian Preterm Infants

Reem N. Said, Mayssa M. Zaki and Manal B. Abdelrazik

in Journal of Tropical Pediatrics

Volume 57, issue 5, pages 333-339
Published in print October 2011 | ISSN: 0142-6338
Published online October 2010 | e-ISSN: 1465-3664 | DOI: http://dx.doi.org/10.1093/tropej/fmq097
Congenital Toxoplasmosis: Evaluation of Molecular and Serological Methods for Achieving Economic and Early Diagnosis Among Egyptian Preterm Infants

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Background: Early diagnosis of congenital toxoplasmosis (CT) is difficult when specific immunoglobulin M (IgM) antibodies are absent, or if persist for months, in the newborn infant's blood. Objectives: To study the risk factors of neonatal toxoplasmosis and to compare different immunologic profiles (Toxoplasma-specific IgM, IgA antibodies and the avidity of IgG antibodies) with polymerase chain reaction (PCR) for reaching economic and early postnatal diagnosis. Materials and Methods: We prospectively studied 80 preterm neonates, recruited from neonatal intensive care units (NICUs) of Cairo University hospitals. Whose gestational age ≤34 weeks with (n = 60) or without (n = 20) CT risk. Serum samples for specific IgA, IgM antibodies and avidity of IgG toxoplasma antibodies were measured by ELISA then compared to PCR. Results: Of the 60 studied cases, 16 (26.7%) were positive for toxoplasmosis by PCR, of which 15 (25%) had low avidity of IgG antibodies (positive), 14 (23.3%) were positive for IgA and 10 (16.7%) were positive for IgM, with sensitivity for avidity of IgG, IgA and IgM: 93.2%, 87.5% and 62.5%, respectively. Conclusion: Determination of avidity of IgG toxoplasma antibodies and/or serological detection of specific IgA for toxoplasmosis offer, simple tests for diagnosis of congenital toxoplasmosis with (better sensitivity) than IgM.

Keywords: Congenital Toxoplasmosis (CT); IgM; IgA; avidity of IgG test; polymerase chain reaction (PCR)

Journal Article.  3203 words.  Illustrated.

Subjects: Paediatrics

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