Legionellosis is a severe bacterial infection, most commonly presenting as pneumonia (Legionnaires' Disease), caused by Legionella bacteria. It is not contagious person-to-person and primarily affects individuals who inhale contaminated water droplets, especially older adults or those with weakened immune systems.
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Legionellosis first gained widespread recognition following a major outbreak in 1976 at an American Legion convention in Philadelphia, Pennsylvania. The causative bacterium, *Legionella pneumophila*, was identified by the CDC shortly after. This event significantly advanced public health understanding of waterborne diseases and the importance of environmental controls in buildings.
Legionellosis is primarily transmitted through the inhalation of small water droplets (aerosols) containing *Legionella* bacteria. These contaminated aerosols are generated from man-made water systems such as cooling towers, hot tubs, showers, decorative fountains, and large plumbing systems. It is not known to spread directly from person to person.
Contagious Period: Varies by disease
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This event envelope contains reports on Legionnaires' diseases cases, clusters and outbreaks in the UK.
Source: BEACON - View Full Report
This event envelope contains reports on Legionnaire's disease cases, clusters and outbreaks in Australia.
Source: BEACON - View Full Report
An unexpected increase in cases of Legionnaires' disease in parts of north-west and south-west London is being investigated by The UK Health Security Agency (UKHSA).
Specialists are trying to find out if the cases are linked and to establish the possible source of the disease.
Experts are looking at each case of the disease to have broken out this year, interviewing patients or their families to retrace their steps to find out if there is a common link, the UKHSA said.
The disease - a severe f
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The wider risk to public health is said to be low as the disease is not usually passed from person to person. Specialists from Britain's Health Security Agency (UKHSA) are investigating a cluster of Legionnaires' disease cases linked to north and southwest London. The public health body is working to discover whether the cases are linked and to establish their possible source. Legionnaires' disease is a severe pneumonia, which is caught by breathing in tiny droplets of water containing Legionella bacteria. These usually come from sources such as air conditioning systems, showers and taps which are not properly designed, installed or maintained. To become infected with the disease, Legionella bacteria in the air have to be inhaled as tiny water droplets from a contaminated source. The wider...
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Paula Wethington is a digital producer at CBS Detroit. She previously held digital content roles at NEWSnet, Gannett/USA Today network and The Monroe News in Michigan. She is a graduate of the University of South Carolina.
Water testing has detected what authorities called "low levels" of Legionella bacteria at two more Oakland County, Michigan, government buildings.
The bacteria were found within two facilities at Oakland County Children's Village, Building D (the boys' secure detention) and t
📰 11 news sources reporting on this story.
This event envelope contains reports on legionellosis in Canada.
Source: BEACON - View Full Report
Tim Fang is a digital producer at CBS Bay Area. A Bay Area native, Tim has been a part of the CBS Bay Area newsroom for more than two decades and joined the digital staff in 2006.
A hospital in Santa Clara County is working to find the source of contamination that led to several people being infected by Legionella bacteria.
Officials at Kaiser Permanente Santa Clara said Tuesday they have confirmed several cases of people being infected by the bacteria. Legionella occurs naturally in water and
📰 15 news sources reporting on this story.
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Hamilton Public Health is investigating several confirmed cases of legionellosis in the city's east end and Stoney Creek area.
In a news release Friday, the city said 13 cases of legionellosis -- a lung infection caused by legionella bacteria -- have been reported since May 4. Public health officials are working to id
📰 11 news sources reporting on this story.
This envelope includes reports on legionellosis (clusters and outbreaks) in the United States.
Source: BEACON - View Full Report
Health authorities have issued an urgent alert to millions of Sydneysiders after Legionnaires' disease was detected in the CBD in the lead-up to Christmas. Three people, who are not known to each other, were hospitalised after they became infected between December 9-18. The trio spent time near Cl... Source: Daily Mail Online - Read Full Article
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View WHO Resources →Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-06-03
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