Stationary cerebrocortical necrosis was observed in a sheep flock. During the consecutive three years 10% of lambs, 3—4 months old were affected. It was found that the appearance of clinical signs preceeded an increase of plasma pyruvic acid level. Therefore, the increase of the content of pyruvic acid may be helpful for the detection of subclinical forms of the disease in a flock but not in an individual sheep.
There was desribed the case of a disease in a large pack of polecat-ferrets. The findings of post-mortem, histopathological and bacteriological examinations showed that a fast-acid bacillus was the cause of the infection; it was classified as Mycobacterium tuberculosis. A man suffering from tuberculosis of lungs, who looked after the animals, was probably the source of the infection.