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Unveiling the Mysteries of Legionella: Intriguing Facts You Need to Know

Updated: May 20, 2023


Some Interesting Facts about Legionella with SM Safety Training & Consultancy

Welcome to our latest blog post, where we delve into the fascinating world of Legionella bacteria. We'll uncover some of the most interesting facts about this waterborne pathogen and how it poses a significant threat to public health. By understanding the nature of Legionella, you can take informed steps to prevent its growth and keep yourself and your loved ones safe.


  1. A deadly discovery: the history of Legionella The Legionella bacteria was first identified in 1976 after a mysterious pneumonia outbreak at an American Legion convention in Philadelphia. The outbreak sickened over 200 people and resulted in 34 deaths. This new strain of bacteria was named Legionella pneumophila, which later became known as the primary cause of Legionnaires' disease.

  2. Legionnaires' disease and Pontiac fever: two faces of the same bacterium Legionella bacteria can cause two distinct illnesses: Legionnaires' disease and Pontiac fever. Legionnaires' disease is a severe form of pneumonia, while Pontiac fever is a milder, flu-like illness. Both are caused by the same bacterium, but the symptoms and severity differ considerably.

  3. Legionella loves warm water Legionella bacteria thrive in warm, stagnant water, especially in temperatures between 20°C and 45°C (68°F and 113°F). These conditions are often found in man-made water systems like cooling towers, hot tubs, and large plumbing systems. The bacteria can also survive in biofilms, which are slimy layers of microorganisms that grow on surfaces in contact with water.

  4. The sneaky spread: how Legionella travels through the air Legionella bacteria can spread through tiny water droplets called aerosols, which can be inhaled into the lungs. This is how Legionnaires' disease is usually contracted. Some common sources of aerosol exposure include showers, faucets, hot tubs, and cooling towers.

  5. Not everyone is equally susceptible While anyone can contract Legionnaires' disease, some people are more susceptible to the illness. Those at a higher risk include individuals over the age of 50, smokers, people with weakened immune systems, and those with chronic lung diseases.

  6. Prevention is key Preventing the growth of Legionella is crucial in reducing the risk of infection. Regular maintenance of water systems, proper water treatment, and temperature control can help keep the bacteria at bay. In addition, early detection and swift response to outbreaks are essential to prevent the spread of the disease.

  7. A global concern: Legionella knows no borders Legionella bacteria and Legionnaires' disease are not limited to any specific region or country. The bacteria have been found in water systems worldwide, making it a global public health concern. Increased awareness, stringent regulations, and effective prevention measures are needed to combat this silent killer.


Conclusion: Legionella bacteria, the cause of Legionnaires' disease and Pontiac fever, poses a significant threat to public health. Understanding the nature of this pathogen and implementing preventive measures can help protect ourselves and our communities from its devastating effects. By staying informed and taking the right steps, we can work together to minimize the risks associated with Legionella and ensure a healthier future for all. If you want to find out more why not try our online course click here Legionella Management.



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