Humoral immune response in hens after vaccination against Turkey Rhinotracheitis

In the present study, the humoral immune response following vaccination aga inst TRT was examined. In the first experiment, white laying-hybrids, 18 and 36 weeks old (2 male and 5 female in each group) were vaccinated twice orally four weeks apart u sing the Aviffa-RTI live vaccine from Rhone Merieux, Lyon. Both groups show ed no distinct increase of TRT antibody titers. In the second experiment, 6 out of 12 broiler breeders were vaccinated oral ly with live vaccine (Aviffa-RTI) in week 12 and 15, followed by inactivate d vaccine TUR 3 from Rhone Merieux in week 19 and 25, whereas 6 received th e inactivated vaccine only. In this experiment, again, no distinct antibody reaction after vaccination with the live vaccine could be observed. Distinct immune response could be detected after application of the inactiv ated vaccine came in the TRT/SHS Avian Pneumovirus ELISA from the SVANOVA B iotech Co., Uppsala, Sweden (homologous virus strain) than in the Pathasure Avian Rhinotracheitis ELISA from the Cambridge Veterinary Science Co., Eng land. A supplementary booster effect following the combined vaccination with live and inactivated vaccines could not be established.