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What is the route of infection for Legionella bacteria? [Basic Knowledge]

Hot springs, baths, and showers also require caution? An explanation of the infection routes of Legionella bacteria.

■What kind of environment does Legionella bacteria prefer? Legionella bacteria thrive in "humid and warm environments." They can survive at 50 degrees Celsius for several hours and cannot multiply below 20 degrees. Approximately 35 degrees is considered the most suitable temperature for survival, making hot springs and bathing facilities ideal environments for Legionella bacteria. The water temperature in air conditioning cooling systems typically ranges from 10°C to 40°C, which is close to the optimal temperature for their proliferation. ■How do infections occur? Legionnaires' disease occurs when bacteria that have proliferated in cooling water are aerosolized from cooling towers, or when bacteria that have grown in water circulation systems or on the surfaces of bathtubs and hot tubs are inhaled through shower sprays or bubbles from jacuzzi baths. ■What are the common risks? Not only cooling towers but also hot springs, bathing facilities, showers, and jacuzzi baths are not free from the risk of Legionella bacteria. ■How can risks be prevented? Managing the water temperature of cooling water and preventing the growth of slime are key points in daily water quality management to prevent the proliferation of Legionella species. Please feel free to consult us.