The Japanese Journal of Veterinary Science

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Corynebacterium renale strains were isolated from cows with pyelonephritis and apparently healthy cattle in the N herd, where pyelonephritis was noticed continually in the last 17 years. They were identified as those of types I and II by the precipitin reaction in gels. Classification of the strains of type I was done by using a phage, RP 6, which had been obtained from a strain isolated in the same herd. The strains isolated from the diseased cows were found to belong to type I, without exception, and those from the apparently healthy cattle to belong to either type I or type II. There was no difference in the response pattern of the type I strains to phage RP 6 between the strains isolated from the diseased cows and those from the apparently healthy cattle. There were some relations between the barn where animals were housed and the type of C. renale isolated from these animals. Type I strains were isolated from all the cows suffering from pyelonephritis and also from the apparently healthy cows housed in the same barns with the diseased cows. Type II strains were isolated from apparently healthy cattle in all the 7 barns, except one, regardless of sex and age. Furthermore, all the strains isolated from males were proved to belong to type II. From the findings mentioned above, discussion was made on the importance of the serological types and phage types of C. renale in understanding the epizootiology of the disease and the ecology of the etiological microorganism.

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