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Immune complex detection in saliva samples: an innovative proposal for the diagnosis of human strongyloidiasis

  • L. R. Bosqui (a1), A. L. R. Gonçalves (a2), M. R. F. Gonçalves-Pires (a2), W. R. Pavanelli (a1), I. Conchon-Costa (a1), J. M. Costa-Cruz (a2) and I. N. Costa (a1)...

Abstract

Human strongyloidiasis is caused by helminth Strongyloides stercoralis. It has a worldwide distribution, often neglected and cause of severe morbidity. The parasitological diagnosis is hindered by the low and irregular amount of larvae in feces. The goal of the present study was to detect IgG and IgG immune complex using conventional serum samples and saliva as alternative samples. We collected samples from 60 individuals, namely: group I composed of 30 healthy individuals; and group II composed of 30 individuals eliminating S. stercoralis larvae in feces. We calculated the area under the curve, general index of diagnostic accuracy, Kappa index and determined the correlations between different diagnostic tests. The detection of IgG levels was performed by an immunoenzymatic assay with alkaline extract of S. venezuelensis larvae as antigen. Positivity of anti-S. stercoralis IgG in serum samples from group I was 3·3%, and from group II 93·3%. The detection of immune complex indicated that group I exhibited 3·3% and group II 56·7%. In the saliva samples, IgG detection was 26·7% for group I and 43·3% for group II. Immune complex was detected in 20% of group I, and 30% of group II. IgG immune complex in conventional serum samples and saliva as alternative samples can be considered biomarkers for the diagnosis of active strongyloidiasis.

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Corresponding author

Author for correspondence: Idessânia Nazareth da Costa, Email: idessania@hotmail.com

References

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Keywords

Immune complex detection in saliva samples: an innovative proposal for the diagnosis of human strongyloidiasis

  • L. R. Bosqui (a1), A. L. R. Gonçalves (a2), M. R. F. Gonçalves-Pires (a2), W. R. Pavanelli (a1), I. Conchon-Costa (a1), J. M. Costa-Cruz (a2) and I. N. Costa (a1)...

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