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You are here: Home / Knowledge / Guidance / Legionella Pneumophila & Legionellosis

Legionella Pneumophila & Legionellosis

Legionella is the genus of bacteria, which gives rise to the risk of infection from diseases, collectively known as legionellosis.

These consist of both pneumonias and non-pneumonic varieties.

The species Legionella pneumophila presents the most serious hazard, which is mainly, but not solely, responsible for causing Legionnaires’ disease.

  • Learn more about Legionnaires’ disease here

This is a pneumonia which has serious effects and is fatal in 10-12% of cases.

Natural and Artificial Water Systems

Legionella is widespread in both natural water sources and artificial water systems.

It proliferates where temperatures are favourable (20-45 oC), nutrients available and water is stagnant or recirculates.

Infection can then occur by the inhalation of aerosols or particles generated from the source.

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Useful downloads…

  • HSE ACOP L8 – Control of Legionella
  • HSG274 Part 1 – Evaporative Cooling
  • HSG274 Part 2 – Hot & Cold
  • HSG274 Part 3 – Other Risks
  • Positive Legionella Tests – What To Do?
  • HSG282 – Spa Pools
  • Legionnaires’ – Duty Holders Guide
  • Health & Safety – Care Homes
  • Scalding Risks – Health & Social Care
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Health & Safety Executive Publish New Legionella ACOP History of Legionnaires disease how will acop l8 hsg274 affect you How Will the New ACOP L8 & HSG274 Affect You?
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