Some studies on the incidence of Ornithobacterium rhinotracheale infection in chicken embryos and layers [electronic resource].

Includes references.

Eighty samples were collected from freshly dead hatched chicks, also one hundred and forty freshly dead layers 8 -12 month old age were collected (35 samples from joint, 35 from oviduct, 35 from brain and 35 from lung, trachea and air sac) from different farms in Assiut Governorate. Ornithobacteriun rhinaotracheale organism was isolated at a rate of 40% from newly hatched chicks and at a rate of 17%, 22.8%, 8.5% and 34% from joint, oviduct, brain and lung, trachea and airsac respectively. Experimental infection of 30 days old chicks by isolated organism through intravenous and intraairsac inoculation was done. Intravenous inoculation leads to depression, ruffling feather of the infected birds and decreased body weight, eye affection, difficult in breathing, nasal secreation and some birds showed nervous signs before death which reached to 30% in the 3rd and 4th day after infection but in the 2nd week postinfection some birds revealed arthritis and could not stand.

Summary in Arabic.