Tracheal lesions in young turkeys infected with Bordetella avium.
Forty-six turkeys were inoculated intranasally with B. avium at 3 days of age. Inoculated and uninoculated turkeys (n = 72) were killed and examined sequentially from 3 to 53 days after inoculation. Tracheal lesions were studied histologically. Mild fibrinopurulent tracheitis, associated with bacterial colonization of ciliated epithelium, was seen at 7 to 10 days. At 14 and 21 days, there were numerous bacterial colonies, loss of ciliated cells, epithelial hyperplasia, depletion of mucus, and diffuse infiltration of lymphocytes and macrophages. At 28 days the mucosa and tracheal rings were severely distorted. The mucosal epithelium, composed of immature epithelial cells and mononuclear leukocytes, had formed prominent longitudinal folds. Mucous glands were cystic and lined with low cuboidal epithelium. At 42 and 53 days the tracheas appeared normal, except for residual distortion of tracheal rings and shortened luminal epithelium.