Respiratory Tract Pathology of the B1 Strain of Newcastle Disease in Chickens

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Abstract
Infection of 3-week-old chickens with the Bl strain of Newcastle disease virus results in lesions that are similar to those associated with infectious bronchitis virus or Mycoplasma gallisepticum infection. Air sacs taken from birds 6 days after infection or later often had epithelial-lined passages beneath the surface.