Horses at risk from virus that can kill in four hours By Charles Clover, Environment Editor Last Updated: 2:27am BST 27/03/2007 A deadly virus that kills horses is poised to arrive in Britain as a result of climate change, scientists warned. African horse sickness, which is spread by the Culicoides midge, kills 90 per cent of horses that catch it. The disease causes bleeding, breathing difficulties, colic and death within four hours of catching the virus. The Government-funded Institute for Animal Health (IAH) described the virus as "probably the worst horse disease on the planet". It could devastate the £4...