Abstract
From among hogs received by the Shibaura Slaughterhouse in the metropolitan area of Tokyo during a period of from August to October, 1958, a tolal of 161 hogs were found to be affected with hog cholera. The prefecture from which infected hogs were received in the largest number was Ibaraki, which was followed by Chiba, and other prefectures in the number of affected animals shipped. Positive diagnoses were made from collective results of serological and histopathological examinations. Neither kinds nor frequencies of occurrence of pathological changes observed were contradictory in general to the descriptions made by previous authors. The frequency of occurrence of macroscopical gastro-intestinal pathological changes, however, was comparatively high.
Salmonella detection was performed on 46 hogs infected with hog cholera. As a result, Salmonella newington was isolated from the spleen and liver of one animal. It seems to be for the first time that this organism was isolated in Japan. Besides, 3 cases of swine erysipelas and one case of hemolytic streptococcal infection were encountered when differential diagnosis was made in the course of diagnosis of hog cholera. On the other hand, detection of HVJ, or the hemagglutinating virus of Japan, was carried out on 7 animals with all negative results.
