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    【Legionnaires’ disease ⁠】What are the origins of Legionnaires’ disease? Is everyone susceptible to it?

    the-origin-and-transmission-of-legionnaires-disease

    While we often hear about Legionnaires’ disease in the news, many may be unsure of its severity or its connection to veterans. Let's explore the origins, transmission, and prevention of Legionnaires’ disease.

    Legionnaires' disease is a type of bacterial pneumonia caused by the Legionellae. Symptoms include fever, headache, muscle aches, cough, difficulty breathing, and shortness of breath. In severe cases, it can lead to neurological symptoms (such as confusion) and respiratory failure, or even death. The incubation period for this disease can range from two to ten days.

    Following the 1976 American Legion Convention at a hotel in Philadelphia, USA, over 200 people contracted an unexplained pneumonia, and 34 of them died, arousing significant concerns. Investigations revealed that the causative agent was Legionella pneumophila. Since most of the infected individuals were veterans of the American Legion, the bacterium was named Legionellae and the disease it caused was called Legionnaires’ disease.

    One key feature of Legionellae is its ability to survive in various environments, especially warm water. They can be found in water tanks, hot and cold water systems, cooling towers, whirlpools, fountains, and humidifiers. People become infected by inhaling contaminated airborne droplets or mist. Under general circumstances, Legionnaires’ disease is not transmitted from person to person through contact or food.

    There is currently no vaccine to prevent Legionnaires’ disease, and anyone is susceptible to it. It is recommended to take proactive steps to minimize the risk of infection as follows:

    • Use properly designed and maintained water systems.
    • Inspect, clean, descale, and disinfect strainers in water taps and showerheads on a regular basis or on a frequency recommended by the manufacturer.
    • When using water filters, ensure they have a pore size of 0.2 micrometers, and replace them periodically.
    • When using and maintaining home respiratory medical devices, follow your doctor’s advice and only use sterile water (not distilled water or tap water) to clean and fill the container.
    • Maintain a balanced diet, get enough rest, refrain from smoking, and avoid alcohol to boost your immune system.

    Legionnaires’ disease is typically treated with macrolide or fluoroquinolone antibiotics. The usual course of treatment is about 7 to 10 days. Longer treatment may be required for patients with more severe symptoms. Early detection is essential to successful treatment.

    While Legionnaires’ disease is relatively uncommon, its complications can be serious. If you feel unwell or experience any symptoms, seek medical attention immediately. Our Cigna VHIS Series – Flexi Plan (Superior) not only offers tax deductions of up to HK$8,000, but also provides a variety of plan levels to choose from. This includes coverage for hospitalisation and psychiatric treatment for individuals with mental health conditions. Whether it is the cost, coverage scope, or value-added services, this plan is designed to meet the needs of the budget-conscious, helping you maximise your savings. Click here to learn more.

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    © Cigna Healthcare 2025
    Information provided in this article is intended for health and fitness purposes only and is not intended for use in the diagnosis of disease or other conditions, or in the cure, mitigation, treatment or prevention of disease (see Terms & Conditions for details). Any health-related information found in this article is available only for your interest and should not be treated as medical advice. Users should seek any medical advice from a physician, especially before self-diagnosing any ailment or embarking on any new lifestyle or exercise regime. Any information contained in this article may not be suitable, accurate, complete or reliable. Cigna Healthcare accepts no responsibility for the content or accuracy of information contained on external websites or resources, or for the security and safety of using them. "Cigna Healthcare" and the "Tree of Life" logo are registered trademarks of Cigna Intellectual Property, Inc. in the United States and elsewhere, licensed for use. All products and services are provided by or through operating subsidiaries, and not by The Cigna Group.

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