Short Communication

Efficacy of a commercially available coryza vaccine against challenge with recent South African NAD-independent isolates of Haemophilus paragallinarum in chickens : research communication

A.A.C. Jacobs, J. Van der Werf
Journal of the South African Veterinary Association | Vol 71, No 2 | a690 | DOI: https://doi.org/10.4102/jsava.v71i2.690 | © 2000 A.A.C. Jacobs, J. Van der Werf | This work is licensed under CC Attribution 4.0
Submitted: 10 July 2000 | Published: 10 July 2000

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A.A.C. Jacobs,
J. Van der Werf,

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Abstract

In South Africa the incidence of NAD-independent Haemophilus paragallinarum isolation from clinical cases is increasing. This study was carried out to test whether a commercially available coryza vaccine (Nobilis (r) Coryza, Intervet International BV) could protect chickens against challenge with recent NAD-independent isolates. SPF chickens were vaccinated twice at 3 and 7 weeks of age and were challenged at 9 weeks of age with 5 different NAD-independent isolates of serotype A or C-3. The results after challenge show that the coryza vaccine induces good protection against challenge with the different South African NAD-independent isolates of H. paragallinarum, including serotype C-3.

Keywords

Coryza Vaccines; Haemophilus Paragallinarum; Poultry; Vaccine Efficacy

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