Bacteria. : The most common cause of kidney infections, or pyelonephritis, is bacteria introduced from the lower urinary tract. The most common cause is escherichia coli (75-95%), then proteus, klebsiella, & staphylococcus. "focal" is a descriptive term, likely from radiology, describing the infection as localized to a specific part of the kidney. Regardless of the description, this is a serious infection.
Answered 12/9/2013
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