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Swimming in Lakes Linked to Legionnaires' Disease Risk, Study Warns - Video

Published On 2025-02-21T08:00:00+05:30  |  Updated On 21 Feb 2025 2:47 PM IST
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Overview

Swimming in some lakes with still water can lead to infection with Legionella, bacteria that can cause pneumonia, and people who engage in open water swimming should be aware of this risk, reveals a practice article published in the Canadian Medical Association Journal.
“Legionella infection represents a public health hazard owing to its ability to spread through exposure to natural water bodies and human-made water reservoirs,” writes Dr. Ashley Bryson, an internal medicine resident at the University of Manitoba, with coauthors.
Legionella infection is an atypical cause of community-acquired pneumonia. Referred to as legionnaires’ disease, it presents with fever, fatigue, respiratory symptoms, and sometimes diarrhea. Legionella bacteria thrive in the warm, stagnant water in plumbing systems, air conditioners, public spas, and even lakes and rivers. Risk factors for legionnaires’ disease include age older than 50 years, smoking history, chronic cardiovascular or kidney disease, diabetes, and a compromised immune system.
Fewer than 100 cases of legionnaires’ disease are reported per year but, as diagnosis is challenging, cases may be underreported.
“Clinicians should consider legionnaires’ disease in patients with pneumonia that does not improve despite the use of broad-spectrum antibiotics, especially if the pneumonia is severe, occurring in immunocompromised patients or patients with recent travel history, or when only antimicrobials without activity against atypical pathogens have been administered,” the authors recommend.
Ref: Ashley Bryson, Martha Shepertycky, Terence Wuerz and Philippe Lagacé-Wiens; Legionnaires’ disease following lake swimming in Iowa: CMAJ February 18, 2025 197 (6) E155-E158; DOI: https://doi.org/10.1503/cmaj.241086

Speakers

Dr. Bhumika Maikhuri

BDS, MDS

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