The company said some residents in and around Liverpool city could notice temporary low water pressure or a loss of supply as engineers re-route water supplies to all customers.

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The virus is highly contagious and spreads through the faecal-oral route - via contaminated water or food.

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No facilities are available en-route and hikers must carry all necessary equipment, medical kits, food and water.

BBC: Hiking Namibia��s Fish River Canyon

Organisers installed four run-through showers along the route and added an extra 2, 600 bottles of water to the normal stock of 25, 000 bottles at each station to help runners deal with the high temperatures.

BBC: Runner dies after London Marathon