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Single dose of Salmonella typhimurium induces humoral immune response.
2003 APR 9 - (NewsRx.com & NewsRx.net) -- A single dose of recombinant Salmonella typhimurium induced specific humoral immune responses against heterologous Eimeria tenella antigens in chickens.
According to recent research from Germany, "Salmonella typhimurium vaccine strains were used as antigen delivery system for oral immunization of chickens against two antigens of the coccidian parasite Eimeria tenella. The cDNAs of the known E. tenella proteins, SO7 and TA4, were isolated from total RNA and subcloned into the expression vectors pQE30 and pTECH2."
"Subcutaneous immunization of chickens with Escherichia coli-expressed SO7 and TA4 revealed that both proteins were immunogenic," reported Thomas Pogonka and colleagues at Humboldt University Berlin and Boehringer Ingelheim Vetmedica GmbH. "Both cDNAs were subcloned into plasmids of the pTECH2 vector system, which allows them to be expressed as fusion proteins with the highly immunogenic fragment C of the tetanus toxin under control of the anaerobically inducible nirB promoter. Plasmids were introduced into the S. typhimurium vaccine strains SL3261, C5aroD, and C5htrA. SDS-PAGE and Western blot analysis revealed expression of both fusion proteins in all strains under anaerobic culture conditions. Three-week-old white leghorn chickens were orally immunized with 10[superscript]9 CFU per animal. The stability of the recombinant bacteria was revealed by recovery of viable Salmonella containing the respective plasmids from the liver of the immunized chickens at day 3 after inoculation. Specific serum IgG ...
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Source: HighBeam Research, Single dose of Salmonella typhimurium induces humoral immune response.