Ornithobacterium rhinotracheale infection in commercial laying-type chickens

Ornithobacterium rhinotracheale is a gram-negative, rod-shaped, pleomorphic bacterium that has been isolated from flocks of turkeys and broilers from around the world. Infections cause respiratory disease, mortality, and grow th suppression, or clinical signs of infection may be absent, in Layers, th ere have been few reports of disease caused by O. rhinotracheale. This is t he first report of O. rhinotracheale infection in United States layer flock s.