Publication date: Aug 01, 2026
Infectious bronchitis virus (IBV) remains a major challenge for poultry production due to its genetic diversity and rapid evolution under vaccination pressure. This study evaluated how changes in vaccination strategy affect IBV lineage dynamics in commercial broiler farms using a sentinel-bird model. Six farms were monitored over 2 consecutive years. During the first survey (Y1), broilers were vaccinated with a combination of Massachusetts (GI-1) and 793B (GI-13) strains, whereas during the second survey (Y2) vaccination was restricted to Massachusetts alone. Non-vaccinated sentinel birds placed within vaccinated flocks were sampled at different time-points for IBV detection, genotyping, and serology. Overall IBV detection reached 65%, with GI-1, GI-13, and GI-16 lineages identified. In Y2, after withdrawal of the 793B vaccine, a significant expansion of the field strain GI-16 was observed (P
Semantics
| Type | Source | Name |
|---|---|---|
| disease | MESH | bronchitis |
| disease | MESH | strains |
| disease | MESH | Mixed infections |
| disease | MESH | Coronavirus Infections |
| disease | MESH | Poultry Diseases |