Studies on Leptospirosis in Animals in Japan
II. The Epizootiological Investigation of Bovine Leptospirosis and Isolation of the Etiological Agent
1961 Volume 35 Issue 2 Pages 111-118
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1961 Volume 35 Issue 2 Pages 111-118
From 1953 to 1959, leptospirosis in native black cattle was studied serologically and bacteriologically. The results obtained are summarised as follows.
1. The main symptom of the bovine leptospirosis was “hemoglobinuria”. However, the results of serological investigation on the bovine leptospirosis revaled that the cases of subclinical infection were much more than those showing the symptom of hemoglobinuria.
2. The hemoglobinuria caused by leptospira infection in cattle has been observed in the limted areas in Japan-nothern parts of Hyogo-Pref. and Kyoto-Pref. Therefore we regarded the hemoglobinuria as an endemic disease in cattle in Japan.
3. This disease in cattle has occur not generally in autumn months, particularly in September and October. The morbidity of this disease was low in calves and increased gradually with age.
4. Author encountered some cases of abortion in the infected cattle, in which both the cases of the hemoglobinuria and those of the subclinical infection were included.
5. Isolations of the etiological agents from the urine of cattle showing the hemoglobinuria were performed, and 25 strains of leptospira organism were obtained successfully. On these 25 strains, we identified 22 strains as L. autumnalis, 2 as L. hebdomadis and 1 as L. australis A. The isolations of L. autumnalis and L. australis A from cattle were considered to be the first case in the world.
