Detection of antigens in paraffin sections of worms and snails infected by Angiostrongylus cantonensis by immunofluorescence reaction / Detecção de antígenos em cortes parafinados de vermes e caramujos infectados por Angiostrongylus cantonensis pela reação de imunofluorescência
Artigo
Inglês
| LILACS, CONASS, Coleciona SUS (Brasil), SES-SP, VETINDEX, SES SP - Acervo do Centro de Documentação/CCD, SES SP - Instituto Adolfo Lutz, SES-SP, SES SP - Acervo Instituto Adolfo Lutz | ID: biblio-1382178
The Indirect Immunofluorescence Assay (IFA) was used to identify stage-specific antigenic structures in paraffin sections of femalelarvae and worms and snailstissues, infected with third stage larvae of Angiostrongylus cantonensis. Sera from eosinophilic meningitis cases were used to assess reactivity. Non-reactive sera from patients with other parasitic diseases and from individuals without other etiologies were used as controls for cross-reactivity. Larvae and worms showed high reactivity to IgGantibodies. IgMantibodies reacted with low intensity only to larvae. Fluorescent reactions were observed in the cuticles and internal structures on worms sections, with a marked reaction in the uterus content. In the snailtissues, the larvae were found exclusively inside the granulomas, with fluorescent markings in the cuticles of the larvae and inside the granulomatous tissues. This fluorescent pattern suggests the presence of excretory/secretory antigens distributed throughout the granulomas. Expressive cross-reactivity occurred in sera from patients with other parasitic diseases, especially strongyloidiasis. The use of IFA applied to paraffin sections to identify structures with antigenic potential and the study of new serological markers, can contribute to the improvement of the laboratory diagnosis of eosinophilic meningitis. (AU)