Legionnaires' - An update

Take a look at what Legionnaire's disease is, how it can affect your business, and what you can do to prevent it.

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What is Legionnaires’ disease?

Legionnaires’ disease is a type of pneumonia.

It was named after an outbreak of severe pneumonia which affected a meeting of the American Legion in 1976.

It is an uncommon but serious disease.

The illness occurs more frequently in men than women.

It usually affects middle-aged or elderly people and it more commonly affects smokers or people with other chest problems.

It is uncommon in younger people and is very uncommon under the age of 20.

How does a person get Legionnaires disease?

The germ which causes Legionnaires’ is a bacterium called Legionella pneumophila.

People catch it by inhaling small droplets of water suspended in the air which contain the Legionella bacterium.

However, most people who are exposed to legionella do not become ill.

Where does the disease come from?

The bacterium that causes Legionnaires’ disease is widespread in nature.

It mainly lives in water, for example ponds, where it does not usually cause problems.

Outbreaks occur from purpose-built water systems where temperatures are warm enough to encourage growth of the bacteria, e.g. in cooling towers, evaporative condensers and whirlpool spas (tradename Jaccuzi) and from water used for domestic purposes in buildings such as offices, factories, hospitals, care homes and hotels.

Most community outbreaks in the United Kingdom have been linked to installations such as wet cooling towers or evaporative condensers, which can spread droplets of water over a wide area.

These are found as part of air-conditioning and industrial cooling systems.

How do you control it?

To prevent the occurrence of Legionnaires’ disease, companies that operate these water systems must comply with regulations requiring them to manage, maintain and treat them properly.

Amongst other things, this means that the water used in the systems must be treated correctly and the system cleaned regularly.

However, the starting point for any control programme is a detailed risk assessment of the buildings water systems or other equipment that is present and uses

How long does the disease take to develop?

Symptoms of Legionnaires’ disease will typically start to develop within 2 to 10 days after you’ve been infected by the bacteria. In some people it may take longer so it’s best to look out for symptoms for around two weeks after being exposed. If you are in any doubt you should see your doctor immediately.

Is Legionnaires disease curable?

If you develop typical symptoms and you are worried that it might be Legionnaires’ disease, see your general practitioner. Because it is similar to the flu, it is not always easy to diagnose.

A blood or urine test (usually a urine-antigen test) will be helpful in deciding whether an illness is or is not Legionnaires’ disease.

When doctors are aware that the illness is present in the local community, they have a much better chance of diagnosing it earlier.

If you suspect that you may have got the illness as a consequence of your work then you are advised to report this to your manager, as well as your health and safety representative and occupational health department, if you have one.

In the UK there is a legal requirement for employers to report cases of Legionnaires’ disease that may be acquired at their premises to the Health and Safety Executive (HSE) http://www.hse.gov.uk/legionnaires/

A legionella risk assessment is an important health and safety process that will protect you, your business and others from harm. In the UK it’s a legal requirement for all businesses to have one.

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