Legionnaires' Disease / Legionellosis

Legionnaires’ disease is an uncommon, severe type of pneumonia caused by Legionella bacteria. A mild form of Legionnaires' disease, known as Pontiac fever, may produce signs and symptoms including a fever, chills, headache and muscle aches. Pontiac fever doesn't infect your lungs, and symptoms usually clear within two to five days.

Legionella bacteria are found in many types of water systems. The bacteria multiply in warm, and stagnant water, such as can be found in air conditioning cooling towers, certain plumbing systems especially showers, spa pools, decorative fountains, sprinklers and nebulisers. The infection is spread through the air from the water source. People become infected when they breathe in aerosols (tiny droplets of water) which have been contaminated with Legionella bacteria. There is no evidence of spread from person-to-person. A type of Legionella bacteria has also been found in potting compost, particularly in warm countries, and gardeners can be infected by breathing in the bacteria through water droplets, dust or from hands contaminated with compost. Legionellosis is very uncommon, with low numbers of infections notified every year in Ireland. Legionellosis is a notifiable disease in Ireland.

Legionella graph 2017

 

Legionellosis in Ireland, 2017

25 The number of legionellosis notifications in 2017
5.3 The national notification rate per 100,000 population in 2017

Last updated: 13 July 2018