“…Among conditions that are particularly vulnerable to pyelonephritis are renal malformations (Camp-bell, 1951), tubular defects (Russell and Barrie, 1936), hypercalcaemia (Schlesinger, Butler, and Black, 1956), acute glomerulonephritis (Kassirer and Schwartz, 1961), and potassium deficiency (Milne, Muehrcke, and Heard, 1957). Any kidney that is damaged by the effects of hypertension will also have a similar predisposition.…”