Is Pyelonephritis contagious?

Pyelonephritis is a type of kidney infection that occurs when bacteria enter the kidneys through the urinary tract. It primarily affects the upper urinary system, including the kidneys and the ureters. This condition is usually caused by bacteria, most commonly Escherichia coli (E. coli), which is naturally present in the intestines and can spread to the urinary tract.

Pyelonephritis is not considered contagious in the traditional sense. It does not spread from person to person through casual contact or respiratory droplets like a cold or flu. However, the bacteria that cause pyelonephritis can be transmitted from one person to another through certain activities or conditions.

Transmission of pyelonephritis-causing bacteria can occur through:

• Sexual intercourse: Bacteria can be introduced into the urinary tract during sexual activity, increasing the risk of infection.


• Unhygienic practices: Poor personal hygiene, such as not wiping properly after using the toilet, can contribute to the spread of bacteria from the anal area to the urinary tract.


• Instrumentation: Inserting medical instruments, such as urinary catheters, into the urinary tract can introduce bacteria and potentially lead to infection.

It is important to note that while pyelonephritis itself is not contagious, the underlying bacteria that cause the infection can be transmitted under certain circumstances. Taking preventive measures, such as practicing good hygiene, using barrier methods during sexual activity, and following proper medical procedures, can help reduce the risk of bacterial transmission and subsequent pyelonephritis.