Most common infectious agent associated with chronic pyelonephritis is:: (A) Proteus vulgaris, (B) Klebsiella pneumonia, (C) Staphylococcus, (D) E.Coli
Answer is D. Chronic pyelonephritis: Bacteriological examination of the urine reveals: E.Coli ( most common ) Proteus species Streptococcus faecalis Pseudomonas species Microscopic features: Tubular thyroidization (filled with colloid casts) Interstitial fibrosis and inflammation Obliterative endaeritis of vessels