What contributes to the growth of Legionella in water systems of healthcare facilities?

The growth of Legionella in water systems of healthcare facilities is primarily attributed to closed pipes without water flow. When water stagnates in these pipes, it creates an environment conducive to the proliferation of bacteria, including Legionella. This organism thrives in warm, stagnant water, where nutrients can accumulate and conditions become ideal for growth. Additionally, lack of circulation can prevent the proper disinfection of water, allowing for further growth of harmful pathogens.

In contrast, other factors such as low-quality disinfectants do not directly foster the conditions needed for Legionella growth; rather, they may simply lessen the effectiveness of the disinfection process. Excessive water use is generally not a contributing factor, as increased water movement helps prevent stagnation. Strict temperature controls are essential in managing risk but can also inhibit Legionella growth when properly maintained, as the bacteria prefers warmer temperatures typically found in the 20°C to 50°C range. Overall, stagnant water from closed pipes uniquely sets the stage for Legionella to thrive.