Tuberculosis in a flock of sheep in the Buller district of New Zealand was investigated in 1970. Seventy sheep which had given positive responses to an intradermal tuberculin test were necropsied. Lesions were found in 43 (61%). The lesions ranged from encapsulated, mineralised foci in single lymph nodes, to extensive, soft, caseous lesions involving entire thoracic or abdominal nodes and forming confluent tubercles in dorsal parts of the lung.