Definition : Infectious nephritis caused by bacterial infection of the kidney is usually an ascending infection from the lower urinary tract. Pyelonephritis is the most commonly diagnosed disease of the kidney in dairy cattle. Reported incidence in practice settings seems to far outnumber other renal diseases such as nephrosis and glomerulonephritis. This may be a true representation or merely supposed because of the relative ease of diagnosis of pyelonephritis as opposed to other conditions that require more ancillary laboratory data for diagnosis   

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