Key result
Six infectious bronchitis virus isolates from Morocco caused typical respiratory disease in chickens, with isolate G showing unique alimentary tract persistence and evading H120 vaccine protection.
Identifies a novel serotype of avian infectious bronchitis virus in Morocco that is not covered by standard H120 vaccines and exhibits prolonged alimentary tract persistence.
May prompt region-specific IB surveillance in poultry; leaves open questions on novel serotype vaccine needs.
The first isolation and characterisation of infectious bronchitis (IB) viruses from poultry flocks in Morocco are reported. Five isolates designated D, E, F, H and M were related serologically to the Massachusetts serotype, while the sixth, isolate G, was found to be different from any previously reported serotype of IB virus. Neutralising antibodies to isolate G have been detected in sera collected from commercial flocks in Britain, although the virus has not been isolated. While all six isolates caused respiratory disease typical of IB in experimentally infected 3-week-old specified pathogen-free (SPF) chickens, isolate G was unusual in that it could be isolated from several parts of the alimentary tract for up to 21 days post inoculation, and from the duodenum up to 28 days. H120 vaccines protected chicks challenged with isolates E and F but not isolate G.
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El‐Houadfi et al. (1986) studied Infectious bronchitis. Infectious bronchitis virus isolates (D, E, F, H, M, G) and H120 vaccine was evaluated on Respiratory disease typical of IB and vaccine protection. Six infectious bronchitis virus isolates from Morocco caused typical respiratory disease in chickens, with isolate G showing unique alimentary tract persistence and evading H120 vaccine protection.
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