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Abstract
Cysticercosis, caused by metacestodes of Taenia solium, has a significant soci-economic impact and is of considerable importance in public health. However, there are no specific diagnostic antigens to distinguish between T. solim and Taenia hydatigena. In the present study, cAMP-dependent protein kinase regulatory subunit (TsPKA-r), an excretory/secretary (ES) antigen of T. solium, was used to establish a specific and sensitive diagnostic tool for detection of porcine cysticercosis. The full-length sequence encoding TsPKA-r was amplified by PCR, sequenced and then identified by bioinformatics. The fusion protein with 6×His-tags was expressed in E. coli, purified by Ni Sepharose™ 6 Fast Flow and used to test reactionogenicity by immunoblotting. TsPKA-r based indirect enzyme-linked immunosorbent assays (iELISA) showed good performance in recognition of sera of pigs experimentally infected with T. solium metacestodes, with 93.88% sensitivity and 96.40% specificity. There were no cross-reactions against the sera from pigs experimentally infected with T. hydatigena, Toxoplasma gondii or Trichinella spiralis. These results indicate that the TsPKA-r is a promising immunodiagnostic antigen for detection of porcine cysticercosis.
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