Pyelonephritis typically begins with colonization of which site before ascending to the kidneys?

Pyelonephritis typically begins with colonization of which site before ascending to the kidneys?

• A. Lower urinary tract
• B. Bloodstream
• C. Lymphatic system
• D. Urinary bladder only

Answer: (A)

In pyelonephritis, the common pathway is an ascending infection starting in the lower urinary tract. Bacteria first colonize the urethra and then the bladder, where a bladder infection (cystitis) can develop. From there, organisms ascend the ureters up to the renal pelvis and kidney tissue, causing inflammation. While the kidneys can be infected via the bloodstream in certain situations, the typical route is from the lower urinary tract up into the kidneys.

In pyelonephritis, the common pathway is an ascending infection starting in the lower urinary tract. Bacteria first colonize the urethra and then the bladder, where a bladder infection (cystitis) can develop. From there, organisms ascend the ureters up to the renal pelvis and kidney tissue, causing inflammation. While the kidneys can be infected via the bloodstream in certain situations, the typical route is from the lower urinary tract up into the kidneys.