In recent years study a proof, evolve by acute pyelonephritis and chronic pyelonephritis is not come, the proportion that acute pyelonephritis admits chronic pyelonephritis is very small.

• 近年来的研究证明，慢性肾盂肾炎并非都是由急性肾盂肾炎演变而来的，急性肾盂肾炎发展成慢性肾盂肾炎的比例很低。