Occurrence: Worldwide
Species affected: Chickens and turkeys. Breeder birds especially affected. Age affected: All ages, especially older birds .
Causes: Gram-negative, non-sporulating rod shaped bacterium, Ornithobacterium rhinotracheale. Recently isolated, formerly known as a Pasturella-like organism, Kingella or Taxon 28.
Effects: Broilers and broiler breeders (24 to 52 weeks of age) show slightly increased mortality, decreased feed intake, mild respiratory signs. Hens show decreased egg production, poor egg shell quality and decreased egg size. In young chickens, coughing, sinusitis, and sometimes respiratory distress and oedema of the head are seen, leading to increased mortality and higher condemnations at processing.