Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
Vol. 105, No. 6, 2010, pp. 757-761
Bioline Code: oc10128
Full paper language: English
Document type: Research Article
Document available free of charge
Memórias do Instituto Oswaldo Cruz, Vol. 105, No. 6, 2010, pp. 757-761
© Copyright © 2010 - Instituto Oswaldo Cruz - Fiocruz
IgG and IgM western blot assay for diagnosis of congenital toxoplasmosis|
Machado, Anderson S.; Andrade, Gláucia M.Q.; Januário, José N.; Fernandes, Matheus D.; Carneiro, Ana Carolina A.V.; Carneiro, Mariângela; Carellos, Ericka V.M.; Romanelli, Roberta M.C.; Vasconcelos-Santos, Daniel V. & Vitor, Ricardo W.A.
The aim of this study was to evaluate the utility of western blot (WB) analysis as a diagnostic tool for congenital toxoplasmosis in 215 newborn infants. The children were submitted to clinical examinations to assess macular, neurological and hearing signals. The WB results obtained were compared to the persistence of IgG antibodies at the end of 12 months, which is regarded as the "gold standard" diagnosis of congenital toxoplasmosis. Association between the WB results and the clinical signs presented by the infants was also assessed. Of the 215 children, 177 had a confirmed congenital toxoplasmosis diagnosis and 38 were uninfected. IgG-WB showed a sensitivity of 73.5% and a specificity of 97.4%. IgM-WB showed a sensitivity of 54.8% and a specificity of 94.7%. The IgG-WB and IgM-WB combination increased the sensitivity to 86.5%. The IgM-WB-positive children had a 1.4-fold greater risk of presenting active macular lesions than did those that were IgM-WB-negative. This study showed that the WB assay is a useful tool to confirm a diagnosis of congenital toxoplasmosis and that the IgM-WB-positive results can indicate active macular lesions in newborn infants.
congenital toxoplasmosis - western blot - macular toxoplasmosis
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