Water is an essential requirement for virtually all life as we know it. Not only do we drink and wash in it, but it is also essential for many industries. However, its use is not free of risk, as this year's Legionnaires' disease and Pseudomonas outbreaks remind us. In the UK there were three fatalities and more than 100 cases of Legionnaires' disease in Edinburgh, shortly followed by two deaths and 15 cases in Stoke-on-Trent.
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