2 patient cases of Legionella pneumonia reported
UW Medicine is working with King County, state and federal agencies to review the cases.Media Contact: Susan Gregg - sghanson@uw.edu, 206-390-3226
Two patients at University of Washington Medical Center – Montlake were recently treated for Legionella pneumonia. Both patients were discharged from the hospital and are in satisfactory condition.
No additional cases of Legionella have been identified at UW Medical Center – Montlake at this time. Since late 2024, a total of four patients have been diagnosed with Legionella. (See previous post from January 2025 describing two previous cases.)
We worked closely with Public Health – Seattle & King County, the Washington State Department of Health, and the Centers for Disease Control and Prevention to review these cases, and continue to work with experts in water treatment.
UW Medical Center – Montlake has a robust water-management program. It includes the testing and monitoring of water temperature, chlorine levels and the presence of water-borne bacteria.
Legionella is present in the natural environment, so it can be difficult to determine the initial source of infections. Legionella is a common water-borne bacteria, and most healthy people who are exposed do not get sick. People at increased risk of getting sick include anyone with certain underlying health conditions such as chronic lung disease or a weak immune system.
Patients with concerns should call their local healthcare provider. For more information about Legionella, please visit the CDC website.
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