Khadijeh Nasiri - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad , Iran
Saeed Zibaee - Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Mashhad, Iran
Mohammadreza Nassiri - Department of Animal Science and Institute of Biotechnology, Ferdowsi University of Mashhad, Mashhad, Iran
Mojtaba Tahmoorespur - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad , Iran
Alireza Haghparast - Department of Veterinary Medicine, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran

Objective(s): Enterotoxigenic Escherichia coli (ETEC) strains are one of the primary causes of diarrhea in newborn calves and in humans, pigs, and sheep. IgY technology has been identified as a promising alternative to generating a mass amount of specific antibody for use in immunotherapy and immunodiagnostics. The purpose of this study was to produce specific antibody by egg yolk antibody (IgY) to recombinant FanC protein from ETEC. Materials and Methods: FanC (K۹۹) gene was amplified from ETEC by specific primers and polymerase chain reaction. The gene was cloned and subcloned into pTZ۵۷R/T and pET۳۲a (+) vectors, respectively. Recombinant vector was transferred into E. coli BL۲۱ CodonPlus (DE۳). Protein expression was investigated by ۱ mM IPTG induction. Hens were immunized by the purified recombinant FanC protein. The activity and specificity of the IgY antibody were detected by dot-blotting, Western blotting, and indirect ELISA. Results: We obtained FanC specific IgYs by immunizing the hens with the recombinant FanC protein. The anti-FanC IgY showed binding specifically to the FanC protein of ETEC. Conclusion: The results emphasize that specific IgY against the recombinant FanC protein could be recommended as a candidate for passive immunization against ETECinfection in animals and humans.

Enterotoxigenic Escherichia coli, IgY, Immunization, Recombinant protein