A potentially fatal lung infection, Legionnaires’ disease, has been identified in two areas of London, prompting a public health investigation.
Experts from the UK Health Security Agency (UKHSA) are working to determine whether the reported cases are linked and to trace the possible source of the outbreak. Legionnaires’ disease is a form of pneumonia caused by Legionella pneumophila, which is contracted by inhaling tiny droplets of contaminated water.
The bacteria often inhabit water systems and can spread through air-conditioning units, humidifiers, hot tubs, and taps or showers that are rarely used. While most cases occur individually, outbreaks can happen under specific conditions, according to the UKHSA.
Treatment generally involves antibiotics, and most patients recover fully over several weeks. Health authorities note that England and Wales typically record around 300 cases of Legionnaires’ disease annually.
Janice Lo, a health protection consultant at UKHSA London, said investigations are ongoing to see if the clusters share a common source. “At this stage, a common source has not yet been confirmed, but we are carrying out further investigations with partners, which will provide more information,” she said.
Lo emphasized that Legionella bacteria are widespread in the environment and can multiply in large building water systems if not properly maintained. “It is essential that water systems are regularly tested and treated to prevent bacterial growth and protect public health,” she added.
Symptoms of Legionnaires’ disease include cough, shortness of breath, chest pain during breathing or coughing, high fever, headaches, muscle aches, and other flu-like symptoms. Anyone experiencing these symptoms is advised to contact the NHS via NHS 111 or consult their general practitioner.
Recent high-profile cases in the UK include the 2023 discovery of Legionella in the water system of the Bibby Stockholm, leading to the evacuation of dozens of asylum seekers, and a fatal case at HMP Lincoln, where contaminated water was later confirmed. The company responsible for prison services was fined £600,000 for health and safety breaches.
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