Lung biopsies were taken through the ninth intercostal space on the two sides of the thorax of 10 clinically healthy sheep, using a Tru-Cut needle on one side and the Bard Biopty-System on the other. Nine of the 10 sheep remained clinically healthy, but one coughed transiently and had a mild bloody discharge from the right nostril immediately after the biopsy. The sheep were slaughtered 10 days later and the lungs and pleura were examined macroscopically; there were either no lesions or only small scars visible at the sites of the biopsies. However, well-developed subpleural nodules due to parasites were observed in some of the lungs. There were no adhesions between the costal and pulmonary pleurae. Of the 20 biopsy specimens, 18 were ideal for histological examination, and none of them was histologically normal. Mild interstitial pneumonia was diagnosed in 15 specimens, chronic bronchiolitis in nine specimens, and hyperplasia of smooth muscle or connective tissue in 17.
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