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- W2768471567 abstract "Despite the importance of Bordetella avium (BA) as a respiratory pathogen of young turkeys, no infection model for the evaluation of BA-vaccine efficacy is available. The objective of this study was to evaluate the influence of route and dose of infection on the establishment of a BA-challenge model. In our first experiment, 28-day-old turkeys were either inoculated oculonasally with 105, 107 or 109 colony forming units (CFU) of BA per bird or exposed to BA by aerosol with 105–108 CFU/m3. The respiratory tract of all inoculated birds was BA-colonized, which was confirmed by choanal swabs and samples of trachea and lung, showing the highest prevalence in the aerosol-inoculated group. BA-specific humoral immune response was detected in the form of IgG in serum from five days post infection (dpi) and IgA in lacrimal fluid from seven dpi. In the second experiment, the model was tested in a vaccination trial. Twenty-one-day-old turkeys were vaccinated with a formalin-inactivated BA vaccine intramuscularly and challenged 21 days post vaccination with 107 CFU per bird oculonasally. BA-specific IgG antibodies were detected in serum and in lacrimal fluid 14 days post vaccination. As in the first experiment, secretory BA-specific antibodies of the IgA isotype were only detected in the inoculated groups from seven dpi. Despite the lack of clinical signs or pathological alterations in both experiments, vaccine efficacy was demonstrated by significant reduction in BA colonization of the trachea (P ≤ 0.05). In our study, a reliable model for BA infection has been established and has been demonstrated to be suitable for evaluation of vaccine efficacy." @default.
- W2768471567 created "2017-12-04" @default.
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- W2768471567 date "2018-01-04" @default.
- W2768471567 modified "2023-09-24" @default.
- W2768471567 title "Establishment of a <i>Bordetella avium</i> challenge model in turkeys" @default.
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- W2768471567 doi "https://doi.org/10.1080/03079457.2017.1408895" @default.
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