A specific infection of the urinary tract associated with a diphtheroid has been encountered in cows from three dairy herds. The most characteristic symptom is the frequent passage of turbid or blood-stained urine. The bladder was always found to be involved. The bladder walls were thickened, the mucosa swollen and reddened. Patches of exudate adherent to the bladder mucosa were frequently observed. In certain instances one or both ureters were thickened. In other cases one or both kidneys were involved. The kidney process seemed to originate in the pelvis and extend toward the medulla and cortex. The characteristic bacilli were always found in large numbers in the urinary sediment and the pelves of involved kidneys.

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