Legionella concerns rise in Finland amid recent bacteria discoveries

Recent discoveries of Legionella bacteria have increased, but they rarely result in illness. Experts express concerns primarily regarding the use of water containing the bacteria. According to researcher Piia Airaksinen from the Finnish Institute for Health and Welfare, there is little risk of inhaling large amounts of contaminated water while drinking, although individuals with severely compromised health may face some risks. Legionella is transmitted through aerosolized water droplets or dust particles and can lead to severe illness, including pneumonia if inhaled during activities such as showering.

To mitigate risks, wearing a mask while showering is advisable if Legionella has been detected in the water system. Airaksinen also recommends closing the toilet lid before flushing as an additional precaution.

From 2014 to 2022, Finland recorded an average of 27 cases of pneumonia caused by Legionella annually, with a notable spike to 54 cases last year. This surge is attributed to improved diagnostic methods and increased awareness among physicians, as well as heightened monitoring of water supply systems due to legislation governing drinking water.

Recent detections of Legionella bacteria have occurred in various locations, including a business building in central Pori and the Junnila camp center owned by local congregations. However, according to Pori’s chief health engineer, Heidi Rosenblad, no infections have been reported from these findings.

In outbreaks, fewer than 5% of those exposed typically develop Legionnaires’ disease, primarily affecting individuals over 50, those with pre-existing conditions, smokers, and immunocompromised persons. The mortality rate for pneumonia caused by Legionella remains between 5-10%, despite antibiotic treatment. Preventative measures include heating hot water to high temperatures and ensuring cold water is kept sufficiently cool, as the bacteria thrive in water temperatures of 20-45 degrees Celsius.