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Brazilian Journal of Microbiology

, Volume 50, Issue 1, pp 139–145 | Cite as

Effects of metaperiodate and urea solutions on the serological diagnosis of human sporotrichosis using an indirect ELISA test

  • Letícia Maria Leomil Coelho
  • Julianne Caravita Grisolia
  • Maria Lúcia
  • Míriam Boczar
  • Eric Batista Ferreira
  • Denismar Alves Nogueira
  • Jorge Kleber Chavasco
  • Zoilo Pires de Camargo
  • Leila Maria Lopes Bezerra
  • Luiz Felipe Leomil Coelho
  • Luiz Cosme Cotta MalaquiasEmail author
Clinical Microbiology - Research Paper
  • 18 Downloads

Abstract

Sporotrichosis is an infection of the skin caused by traumatic inoculation of the fungus Sporothrix schenckii. Definitive diagnosis relies on direct visualization of the fungus or its isolation on culture medium, although both have low sensitivity. Alternatively, the detection of the antibody response offers a more rapid alternative for diagnosis. Although the available immunoassays possess good sensitivity and specificity, cross-reactivity is still a problem. This study aimed to evaluate the effect of sodium metaperiodate and 6 M urea solutions on the serological diagnosis of sporotrichosis using an enzyme-linked immunosorbent assay (ELISA) test. Ninety-six-well plates were sensitized with exoantigens from the yeast phase of S. schenckii. Sera of patients with confirmed sporotrichosis, sera of patients with paracoccidioidomycosis, and sera of individuals with a sporotrichin-negative skin test were tested. Two strategies were used; the first consisted of treating the antigen with sodium metaperiodate solution for different incubation times, and the second consisted of treating the serum with 6 M urea solution for different incubation times. ROC curve analysis revealed that the best discrimination parameters were obtained using 6 M urea solution incubated for 5 min and serum dilution at 1/600. The use of 6 M urea solution improves the performance of the ELISA test in the diagnosis of sporotrichosis.

Keywords

Human sporotrichosis ELISA Sodium metaperiodate Urea Sporothrix schenckii 

Notes

Acknowledgments

We thank Prof. Dr. Mario Leon Silva Vergara from Universidade Federal do Triângulo Mineiro (UFTM) for providing sera and information about the medical status of the patients included in this study. We also thank Dr. Rosane Orofino Costa of Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil for her clinical contribution for the sera collection supported by Faperj/PPSUS project. Also, we thank Dr. Felipe Fornias Sperandio and Dr. Anderson Messias Rodrigues for their critical review of the manuscript and Dr. Jorge Kleber Chavasco in the production of rabbit antibodies against S. schenckii antigens.

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Copyright information

© Sociedade Brasileira de Microbiologia 2018

Authors and Affiliations

  • Letícia Maria Leomil Coelho
    • 1
  • Julianne Caravita Grisolia
    • 1
  • Maria Lúcia
    • 2
  • Míriam Boczar
    • 2
  • Eric Batista Ferreira
    • 3
  • Denismar Alves Nogueira
    • 3
  • Jorge Kleber Chavasco
    • 1
  • Zoilo Pires de Camargo
    • 4
  • Leila Maria Lopes Bezerra
    • 5
  • Luiz Felipe Leomil Coelho
    • 1
  • Luiz Cosme Cotta Malaquias
    • 1
    Email author
  1. 1.Departamento de Microbiologia e Imunologia, Instituto de Ciências BiomédicasUniversidade Federal de AlfenasAlfenasBrazil
  2. 2.Universidade José do Rosário VellanoAlfenasBrazil
  3. 3.Instituto de Ciências ExatasUniversidade Federal de AlfenasAlfenasBrazil
  4. 4.Departamento de Microbiologia, Imunologia e ParasitologiaUniversidade Federal de São PauloSão PauloBrazil
  5. 5.Laboratório de Micologia Celular e ProteômicaUniversidade do Estado do Rio de JaneiroRio de JaneiroBrazil

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