Key result
A single vaccination with Avishield IB H120 protected 94% of spray-vaccinated chickens at 7 weeks, and 80% of spray-vaccinated and 75% of orally-vaccinated chickens at 8 weeks against IBV challenge.
Why the study?
Long duration of immunity is preferred for hatchery vaccination against infectious bronchitis, but Avishield IB H120 has a declared immunity period of only up to 5 weeks.
Does single vaccination with Avishield IB H120 protect SPF chickens against challenge with virulent IBV strain M41 up to 8 weeks?
Does single vaccination with Avishield IB H120 protect SPF chickens against challenge with virulent IBV strain M41 up to 8 weeks?
A single vaccination with Avishield IB H120 provides protection against infectious bronchitis virus challenge in SPF chickens for up to 8 weeks.
The most effective means of controlling infectious bronchitis in poultry is by vaccination. Live attenuated vaccines based on the H120 strain (Mass serotype) are the most commonly used vaccines. Since vaccination is often performed in the hatchery, long duration of immunity is preferred. Avishield IB H120, a live attenuated vaccine based on the strain H120 is registered across the European Union and other countries, and has a declared immunity period of up to 5 weeks after vaccination. This study presents the results of an additional survey demonstrating protection against challenge with the IBV strain M41 up to 8 weeks after a single vaccination with Avishield IB H120. Seven weeks after vaccination, 94% of chickens vaccinated by spray were protected against the challenge. Eight weeks after vaccination, 80% of spray vaccinated chickens and 75% of orally vaccinated chickens were still protected against the challenge with virulent IBV.
No takes yet. Share an insight, caveat, or question.
Skupnjak et al. (2020) studied Infectious bronchitis. Avishield IB H120 vaccine was evaluated on Protection against challenge with virulent IBV strain M41. A single vaccination with Avishield IB H120 protected 94% of spray-vaccinated chickens at 7 weeks, and 80% of spray-vaccinated and 75% of orally-vaccinated chickens at 8 weeks against IBV challenge.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: