Ornithobacterium rhinotracheale, or ORT, is a bacterium that causes respiratory disease in poultry.

[2] O. rhinotracheale is found worldwide, and the bacterium may be spread between birds either horizontally or vertically.

A drop in growth rates and abnormal egg production and joint problems may also be seen.

The disease caused by ORT is characterized by pneumonia, pleuritis and air sacculitis on postmortem examination.

Diagnosis should be confirmed using laboratory tests such as bacterial culture, PCR, agar gel precipitation, ELISA, or serum agglutination.