Georgia Researchers Study IBV Hatchery Vaccination
US - Hatchery spray cabinet administration of Arkansas vaccine produces less then desirable protection against infectious bronchitis virus (IBV), according to new reseach from the University of Georgia.
29 March 2012
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Infectious bronchitis (IB) is a highly contagious upper-respiratory tract disease in chickens that is extremely difficult to control because different types of the virus causing the disease do not cross-protect.
In a recent study, Dr Mark W. Jackwood and his team at the University of Georgia examined infectious bronchitis virus (IBV) field boost vaccination in commercial broilers and found that the number of birds positive for vaccine virus followed a parabolic shaped curve that peaked at 14 days post-vaccination or resembled a sinusoidal type wave with a frequency of about two weeks. In addition, the vaccine type isolated from broilers was always Arkansas, and birds were not completely protected against Arkansas challenge.
The hypothesis for their latest research, sponsored by the US Poultry & Egg Association, was that inadequate immune system priming through the administration of IBV vaccines in the hatchery was occurring.
The objective of this project was better to understand the dynamics of hatchery vaccination for IBV as it relates to persistence of Arkansas type viruses in broilers.
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