Iranian Journal of Parasitology 2015. 10(1):30-8.

Evaluation of Dot Immunogold Filtration Assay (DIGFA) By Recombinant Protein EPC1 for Anti- Echinococcus granulosus IgG Antibody.
Somayeh Kordafshari, Seyed Hossein Hosseini, Fatemeh Jalousian, Masoumeh Rajabibazl, Malcolm Jones, Fazeleh Etebar



Background: Cystic echinococcosis is an important zoonosis caused by the Echinococcus granulosus with a substantial impact in human and animal health in en-demic areas. The purpose of the present study was serodiagnosis optimizing of dog echinococcosis in order to achieve a rapid diagnostic method.

Methods:Eight dogs were challenged with protoscoleces in order to have posi-tive echinococcosis serum and 2 two-month old puppies were used as uninfected controls. Colloidal gold was prepared by controlled reduction of a boiling solu-tion of chloroauric acid (H [AuCl4]) with sodium citrate and labeled with recom-binant EPC1. Dot immunogold filtration assay (DIGFA) was developed by coat-ing rEPC1 labeled colloidal gold on nitrocellulose membrane. The canine sera, taken three times including, 15, 28 and 35 days post infection were tested. A total of 30 serum samples including 24 sera from 8 infected dogs and 6 sera from 2 puppies were comparatively detected with both DIGFA and ELISA.

Results:Gold labeled antigen, showed a dark purple dot with agglutination parti-cles in positive sera and light purple dot without agglutination in negative sera. Among 30 serum samples, 23 were positive and 7 were negative with DIGFA and 24 were positive, 6 were negative with ELISA.

Conclusion:DIGFA as a rapid and simple procedure could be utilized in quickly diagnosis of echinococcosis.


Dot immunogold filtration assay; Echinococcus granulosus; Recombinant EPC1; Serodiagnosis

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