Evaluation of a herpesvirus of turkey vector vaccine inducing protection against infectious bursal and marek's diseases (VAXXITEK® HVT + IBD) under Philippines field conditions
J.C. Atienza, A.J. Nagera, P.O. Martinez, N.D. Baysac, M.T. Castillo, V.R. Damaso and S. Lemiere
A field study was conducted to evaluate the safety and efficacy of a Herpesvirus of Turkey (HVT) vector vaccine inducing protection against Infectious Bursal Disease (IBD) and Marek's disease (MD) (VAXXITEK HVT + IBD) when administered to day-old broiler chickens under Philippines field conditions. 75,000 birds from 3 broiler farms were observed. Each farm had two groups: one vaccinated with VAXXITEK HVT+IBD and the other kept as the control group. Vaccinated group received 0.2mL of VAXXITEK HVT + IBD by subcutaneous injection at the back of the neck at day-old. Control group received the IBD vaccines specified in current vaccination programs. Safety was assessed by evaluation of the overall health condition and mortality rate. Efficacy was assessed by the absence of clinical IBD and clinical MD, IBD-ELISA titres and flock production performances. Safety and efficacy of VAXXITEK HVT + IBD were demonstrated in this study.
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