Ornithobacterium rhinotracheale (ORT) is a species of bacteria that is gram-negative, non-motile, microaerophilic, pleomorphic rods, found from many wild and domesticated species of birds, and is an emerging poultry pathogen (Ornithobacteriosis), causing an acute, contagious respiratory disease (pneumonia and airsacculitis) in chickens, turkeys, and older birds.