Vaccine tweaks can make a big difference against key infectious bronchitis virus strain

calendar icon 1 September 2022
clock icon 1 minute read

New challenge studies have highlighted the best vaccine serotype combinations to tackle the DMV/1639 strain of infectious bronchitis virus (IBV), which has spread from the Delmarva area to become the predominant strain across the broiler belt and beyond.

Vaccination using commercial vaccines is the most common approach used against the strain, and the research looked at some of the main serotypes used in commercial flocks — Massachusetts, Arkansas, Georgia/98 and Georgia/08 — in two- and three-way combinations.

Commercial broilers were spray-vaccinated at hatch and placed into randomized isolator units with five isolators per vaccine treatment. Real-time polymerase chain reaction (PCR) was used to analyze tracheal samples for vaccine “takes” at 6 to 7 days. Birds were challenged with IBV at 25 to 26 days of age and protection was evaluated on day 31 using histological scoring and real-time PCR.

Read the full article on Poultry Health Today

References
References
1.
Data on file. Additional Study No. 032419-KL-70AQO-KC-5820. Zoetis LLC.
2 Jordan B, Reith A.
(2021) Results of an infectious bronchitis virus surveillance program in broiler chickens. SCAD abstract T7 p24-25. Virtual International Poultry Scientific Forum.

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