Evaluation of protection conferred by a vaccination program based on the H120 and CR88 commercial vaccines against a field variant of avian infectious bronchitis virus

Abstract : Due to serotype variations among different avian infectious bronchitis viruses isolated in Tunisia since 2000, protection of chicks, especially broiler flocks, with Mass H120 vaccine often fails. Therefore, association of CR88 (793B type) with H120 vaccines was used for better response. Challenge experiments were then conducted to evaluate tracheal and renal cross-protection in chickens immunized via nasal and eye drops. Conferred protection was measured by clinical signs and macroscopic lesions observed, based on scores attributed according to their severities. The results showed a low protection conferred by H120 alone, as vaccination did not reduce tracheal and kidney lesions (70% scored as 3) after TN20/00 virus challenge, which also led to 10% mortality. Conversely, the challenge results indicated that the combination of the 2 strains (H120/CR88) allow high protection. Based on the results of the challenge experiments, a vaccination protocol coupling CR88 to H120 was applied for industrial broiler flocks. Clinical observations and serological results confirmed that association of heterologous serotypes (H120 and CR88 vaccines) increased the levels of protection against infectious bronchitis viruses compared with the H120 vaccine given alone.
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Journal of Applied Poultry Research, Oxford University Press (OUP), 2014, 23 (2), pp.156-164. 〈10.3382/japr.2013-00828〉
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Contributeur : Institut Pasteur Tunis <>
Soumis le : mercredi 6 septembre 2017 - 10:59:14
Dernière modification le : lundi 5 février 2018 - 15:22:14

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Hager Bourogâa, Imen Larbi, Khaled Miled, Ymene Kort Hellal, Jihene Hassen, et al.. Evaluation of protection conferred by a vaccination program based on the H120 and CR88 commercial vaccines against a field variant of avian infectious bronchitis virus. Journal of Applied Poultry Research, Oxford University Press (OUP), 2014, 23 (2), pp.156-164. 〈10.3382/japr.2013-00828〉. 〈pasteur-01375048〉

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