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  • Title: IMMUNODIAGNOSIS OF HUMAN STRONGYLOIDIASIS: USE OF SIX DIFFERENT ANTIGENIC FRACTIONS FROM Strongyloides venezuelensis PARASITIC FEMALES.
    Author: Corral MA, Paula FM, Gottardi M, Meisel DM, Castilho VL, Gonçalves EM, Chieffi PP, Gryschek RC.
    Journal: Rev Inst Med Trop Sao Paulo; 2015; 57(5):427-30. PubMed ID: 26603231.
    Abstract:
    The aim of this study was to evaluate six different antigenic fractions from Strongyloides venezuelensis parasitic females for the immunodiagnosis of human strongyloidiasis. Soluble and membrane fractions from S. venezuelensis parasitic females were prepared in phosphate-buffered saline (SSF and SMF, respectively), Tris-HCl (TSF and TMF, respectively), and an alkaline buffer (ASF and AMF, respectively). Serum samples obtained from patients with strongyloidiasis or, other parasitic diseases, and healthy individuals were analyzed by enzyme-linked immunosorbent assay (ELISA). Soluble fractions SSF, TSF, and ASF showed 85.0%, 75.0%, and 80.0% sensitivity and 93.1%, 93.1%, and 87.5% specificity, respectively. Membrane fractions SMF, TMF, and AMF showed 80.0%, 75.0%, and 85.0% sensitivity, and 95.8%, 90.3%, and 91.7% specificity, respectively. In conclusion, the present results suggest that the fractions obtained from parasitic females, especially the SSF and SMF, could be used as alternative antigen sources in the serodiagnosis of human strongyloidiasis. O objetivo deste estudo foi avaliar seis frações antigênicas diferentes de fêmeas parasitas de Strongyloides venezuelensis para o diagnóstico sorológico da estrongiloidíase humana. As frações solúveis e de membrana de fêmeas parasitas de S. venezuelensis foram preparadas em solução salina tamponada (SSF e SMF, respectivamente), Tris-HCl (TSF e TMF, respectivamente) e tampão alcalino (ASF e AMF, respectivamente). As amostras de soro obtidas de pacientes com estrongiloidíase, com outras parasitoses e indivíduos saudáveis, foram analisadas pelo ensaio imunoenzimático (ELISA). As frações solúveis SSF, TSF e ASF apresentaram sensibilidade de 85,0%, 75,0%, e 80,0% e especificidade de 93,1%, 93,1% e 87,5%, respectivamente. As frações de membrana, SMF, TMF e AMF demonstraram sensibilidade de 80,0%, 75,0%, e 85,0%, e especificidade de 95,8%, 90,3% e 91,7%, respectivamente. Em conclusão os presentes resultados sugerem que as frações obtidas a partir de fêmeas parasitas, especialmente o SSF e SMF, podem ser utilizadas como fonte alternativa de antígenos no imunodiagnóstico da estrongiloidiase humana.
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