11/29/2022: 

Coryza is caused by the Avibacterium paragallinarum bacterium. This bacterium causes infection of the upper respiratory tract in chickens. The clinical signs include respiratory problems, swollen sinuses, and nasal discharge. Besides respiratory signs the disease is also characterized by an acute decrease in egg production. After recovery of the disease the bacterium remains present in the flock (carrier flock).

The importance of genotyping

Since 2021, Royal GD has a test available for genotyping of A. paragallinarum. Genotyping of strains enables us to monitor the introduction of possible new (potentially pathogenic) strains and to link any outbreaks. In 2021, we were able to identify genotypes GT4, GT7, GT8, GT26, GT27 and GT31 in outbreaks among commercial and backyard poultry. Over the first six months of 2022, we found two new genotypes in carrier flocks (commercial poultry): GT14 and GT19. GT14 was also found in backyard poultry. 

You can read more about this in the highlights report poulty of October 2022.

In this report you can also find more information about further analysis of high ND titres

Highlights reports poulty of October 2022