Legionellosis is a collective term for diseases caused by Legionella bacteria. The most serious, Legionnaires’ disease is a potentially fatal form of pneumonia. Everyone is susceptible to infection, however risks are increased with age, in heavy drinkers, smokers and in people with certain health conditions (e.g. diabetes, respiratory conditions and conditions that affect the immune system). Other similar but less serious conditions are Pontiac fever and Lochgoilhead fever.
The bacteria that causes Legionellosis are common in natural water sources such as rivers, lakes and reservoirs, but usually in low numbers. They may also be found in purpose-built water systems such as hot and cold water systems and spa pools. If conditions are favourable, the bacteria may grow, increasing the risks of Legionnaires’ disease. Exposure is usually through inhaling contaminated water when it's dispersed in the air as an aerosol.
The legal requirements for the control of Legionella is covered by the Control of Substances Hazardous to Health Regulations 2002 and the HSE Approved Code of Practice: Legionnaires' disease. The control of legionella bacteria in water systems (L8).
The risks from Legionella increase if:
The University is required by law to have appropriate measures in place to control the risk of Legionellosis. Our Legionella Management Policy and Plan (.pdf) sets out our arrangements for managing:
Common methods of controlling risk in hot and cold water systems is by maintaining water temperatures so they are outside the above range, regular descaling, and flushing little used water outlets to ensure water cannot stagnate. Regular monitoring is needed to ensure these control measures are effective.
The Registrar and Secretary is the duty holder with overall responsibility for ensuring that there are effective arrangements in place and that adequate resources are allocated to the control of Legionella on the University’s Estate.
The Estate Management Section has prime responsibility for managing risks from Legionella within fixed water systems that are part of the “built environment” across the University's estate. Specific responsibilities are detailed in the Legionella Management Policy and Plan (.pdf).
Staff responsible for outlet flushing, cleaning or scale removal of shower heads must:
The symptoms of Legionnaires' disease are similar to the symptoms of the flu:
Leading on to symptoms of pneumonia such as:
If you develop the above symptoms and are worried that it might be Legionnaires' disease (because you have been exposed to spray or mist), see your GP. The illness is treatable with antibiotics. If you think exposure may have occurred while working at the University, tell your manager or the Health and Safety Advisory Service as soon as possible.