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Testing for Legionnaires’ disease

06 Mar, 2014

Legionnaires’ disease is a severe form of pneumonia. In New Zealand, it is most commonly associated with gardening activities. Christchurch Hospital now tests every pneumonia patient for Legionnaires’ disease.

Listen to audio: Testing for Legionnaires’ disease

Duration: 12:54

A potentially fatal disease

One third of those suffering from Legionnaires’ disease end up in intensive care, and for 10% of the patients, it is fatal. Getting the correct diagnosis for Legionnaires’ disease is essential. Ruth Beran speaks with clinical microbiologist David Murdoch, infectious disease clinician Stephen Chambers and Ros Podmore about their collaborative efforts to quickly screen for this disease.

Using PCR – polymerase chain reaction tests and traditional cultures

Every patient presenting with pneumonia is routinely tested for Legionnaires’ disease. Each sputum sample has a polymerase chain reaction (PCR) test to detect Legionella bacteria DNA. The PCR test is very sensitive so it can identify the bacteria much more quickly than culturing it in an agar plate. The clinicians still culture the bacteria for their reference lab. This allows them to look at the bacteria strains in detail and test to see if antibiotics are working.

Identifying trends to prevent future outbreaks

David and Stephen found that, in Canterbury, the disease peaks every year in November. The disease cannot be transmitted from person to person – it has to come from an environmental source like soil or compost. They are working to identify the risk factors in people’s gardening behaviours with the hope of introducing prevention strategies.

Programme details: Our Changing World

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