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Published on: 7/21/2026
Who is at high risk for Legionnaires' disease?
Legionnaires' disease is a serious form of pneumonia caused by Legionella bacteria. Certain groups face a significantly higher risk, including:
- Adults over 50, whose immune defenses naturally weaken with age
- People with weakened immune systems, such as those with cancer, diabetes, kidney disease, or HIV
- Current or former smokers and those with chronic lung conditions like COPD
- Workers in high-exposure jobs, including construction, plumbing, transportation, and hospitality, where contact with water systems, cooling towers, or aerosolized water is common
Early symptoms — cough, fever, muscle aches, and shortness of breath — can mimic the flu, making timely identification critical. If you're in a high-risk group and feeling unwell, don't wait to find out what's going on. A free, instant symptom check can help you understand your symptoms in minutes and guide your next steps, whether that's rest, a call to your doctor, or urgent care. It's private, powered by medical AI, and could make all the difference in catching a serious illness early.
Reviewed for medical accuracy: 07/20/2026
What brings you in today?
Explanation
Legionnaires' disease is a lung infection caused by bacteria found in water. Some people are more likely to get sick from it.
Who is at High Risk?
- Older Adults: People over 50 are more likely to get Legionnaires' disease.
- Weakened Immune Systems: If someone has a weak immune system, they might get sick more easily. This can happen if they have other illnesses or are taking certain medicines.
- Certain Jobs: People who work in jobs like construction or transportation might have a higher risk. This is because they might be exposed to the bacteria more often.
Why Does This Matter?
Knowing who is at risk can help keep people safe. If you or someone you know is in one of these groups, it might be a good idea to be extra careful around water sources that could have the bacteria, like air conditioning systems or hot tubs. If you're experiencing symptoms like fever, cough, or shortness of breath, you can quickly check your symptoms to better understand what might be causing them. Always remember to follow safety guidelines at work to stay healthy.
(References)
Gerchikova NM, Demmes LA, Bodiul' VN, Barkhatova OI, Radchenko OV, Rusakova EV, et al. (1990). [The immune structure of occupational groups .... Zhurnal mikrobiologii, epidemiologii i immunobiologii, 2150144.
Cooley LA, Pondo T, Francois Watkins LK, Shah P, Schrag S, & Active Bacterial Core Surveillance Program of the Emerging Infections Program Network. (2020). Population-Based Assessment of Clinical Risk Factors for .... Clinical infectious diseases : an official publication of the Infectious Diseases Society of America, 31617567.
Harduar Morano L, Morawski BM, Herzig CTA, Edens C, Barskey AE, & Luckhaupt SE. (2024). Legionnaires' disease in transportation, construction and .... Occupational and environmental medicine, 38360725.
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