Evaluation of unintended 1/96 infectious bronchitis vaccine transmission in broilers after direct contact with vaccinated ones

Published on: 10/23/2019
Author/s : E. Pellattiero 1, C.M. Tucciarone 1, G. Franzo 1, G. Berto 2, K. Koutoulis 3, A. Meini 2, C. Zangrandi 2, G. Ramon 3, M. Drigo 1, M. Cecchinato 1. / 1 Department of Animal Medicine, Production and Health (MAPS), University of Padua, Legnaro, Italy; 2 Ceva Salute Animale, Agrate Brianza, Italy; 3 Ceva Sante Animale, Libourne, France.

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 ...

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Mustafa Ezat Mustafa Ezat
Veterinary Doctor
October 23, 2019
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
October 23, 2019

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.

October 29, 2019
Mattia Cecchinato what if we keep birds 2-3 hour? We do IB variant and IB classical.

October 30, 2019
I think in term of spread no difference.
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