What is pyelonephritis emergency?

Pyelonephritis :Acute pyelonephritis is a clinical syndrome of chills, fever, and flank pain that is accompanied by bacteriuria and pyuria Routes of Infection: - Ascending Route(++) -Hematogenous route: It is a rare route of infection –Urinary Pathogens :E.coli (+++),Klebsiella , proteus , staph.saprophyticus , pseudomonas , serratia ….