Frequently Asked Questions

Legionnaires disease is a potentially deadly form of pneumonia and one of a group of diseases caused by the Legionella bacterium. Collectively these diseases are known as legionellosis.

Anyone is at risk of infection from Legionnaires disease and the risk increases with age. The following groups of people, however, are particularly susceptible:

– People aged 45 and over
– People who smoke and drink heavily
– Those who suffer from a chronic respiratory condition
– Those who suffer from diabetes
– Those who suffer from lung, heart or kidney disease
– Anyone whose immune system is impaired

Although the bacterium that causes Legionella pneumophila is commonly found in sources of natural water such as lakes, rivers and reservoirs, it is rarely found in great numbers. More perilously, it can also be observed in built-for-purpose water systems such as spa pools, cooling towers, hot and cold water systems or evaporative condensers. Indeed, wherever conditions are favourable, the bacteria can thrive and the risks of Legionnaires’ disease are increased.