Samples being tested for Legionella bacteria
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Legionnaires' outbreak: hunt for source continues

7 June 2012 Last updated at 09:35 BST

Investigations continue into the source of an outbreak of Legionnaires' disease in Edinburgh.

40 people have been treated so far, with 12 of those in intensive care.

The number of cases is expected to rise further over the weekend.

Cooling towers have been identified as the probable source of infection and four different industrial sites have been chemically cleaned.

Eleanor Bradford reports.