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.
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.
Période de Contagiosité : Varies by disease
5 countries with reported activity. Updated from real-time surveillance data.
1 state with reported activity. Click a state for detailed surveillance.
Renseignements en temps réel issus de la surveillance sanitaire mondiale et de la surveillance par IA
Sources de données : BEACON, ProMED, OMS, CDC et plus de 50 agences nationales de santé
✓ Données en direct mises à jour en temps réel depuis les sources de santé mondiales
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
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
đź“° 11 news sources reporting on this story.
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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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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
đź“° 11 news sources reporting on this story.
ST. LOUIS COUNTY, Mo. - An elementary school in the Ritenour School District will remain closed after a teacher there disclosed that she had been hospitalized for Legionnaires' disease during the school year.
In separate statements to staff and families in the district and Marvin Elementary School, Superintendent Dr. Chris Kilbride said administrators learned late Tuesday evening that a teacher said she was ill in late April and early May and had been hospitalized for Legionnaires.
The teacher
đź“° 12 news sources reporting on this story.
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
đź“° 15 news sources reporting on this story.
This event envelope contains reports on legionellosis in Canada.
Source: BEACON - View Full Report
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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
đź“° 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
Suivez Legionellosis et plus de 200 autres maladies avec des alertes personnalisées
Informations fiables provenant des principales organisations de santé
Directives officielles des Centers for Disease Control and Prevention des États-Unis
Voir les Ressources du CDC →Surveillance mondiale des maladies et directives de l'Organisation Mondiale de la Santé
Voir les Ressources de l'OMS →Les informations sur les maladies sur Virus Watcher sont révisées par notre Épidémiologiste en Chef, ancien analyste principal du CDC pour les prévisions FluSight. Les données épidémiques sont agrégées à partir de sources vérifiées notamment BEACON, ProMED, OMS, CDC et plus de 50 agences nationales de santé. Ces informations sont à des fins éducatives et ne doivent pas remplacer les conseils médicaux professionnels.
Dernière révision : 2026-06-29
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