Evaluation of unintended 1/96 infectious bronchitis vaccine transmission in broilers after direct contact with vaccinated ones
Published:September 2, 2019
Summary
Infectious bronchitis (IB) was described in the USA for the first time as a respiratory disease of chickens. Its aetiological agent was isolated in 1936 and then identified as a Gammacoronavirus, namely infectious bronchitis virus (IBV) (Cook et al. 2012). Being a single-stranded RNA virus, IBV is highly susceptible to spontaneous mutation and genetic recombination, meaning that a large number of...
dear
contact time 5 hrs. at hatchery or during transportation that enough for evaluation safety of vaccine and spreading capability from vaccinated to unvaccinatted chicks ,I need clarification
thanks with my best wishes
Dear, the safety of the vaccination was evaluated looking at clinical signs in all groups every day for 11 days (the end of the trial).
The aim of our paper was to evaluate the spreading of the vaccine during standard operation at the hatchery where, in some cases, chicks need to be vaccinated with different vaccines and also transported together with animal vaccinated with different vaccines. For this reason, we keep the different vaccinated chicks in contact for 5 hours.
In the field in the same flock vaccinated birds could stay for longer time in contact with unvaccinated birds (it's difficult to reach 100% of vaccine coverage) and so the spread of the vaccine could, of course, be different.
I hope to answer your question and if you need more clarification do not hesitate to contact me.
Perhaps I am missing someting, but I think that instead of table 1, table 2 is placed. This means table 2 is twice in your publication.
Regards,
Peter Wijnen
Dear Wijnen ,
table one in the original publication is referred to Animal groups and adopted vaccine program
Control group was vaccinated with Mass plus 1/96 strain while hatchery and truck groups were only vaccinated with Mass vaccine.
Best regards,
Mattia
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