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Scientists from World Health Organization (WHO) say world is possibly at risk from deadly disease. However, they do not know its name or what it does and looks like. They have called it 'Disease X'. It could be caused by virus or another micro-organism that scientists don't yet know about. The WHO said Disease X could go unnoticed until it is too late and it is quickly spreading around world. The WHO is taking threat of Disease X seriously. It is putting lot of money into research and is preparing a plan for sudden outbreak. It said: "Disease X represents the knowledge that serious international epidemic could be caused by [virus] currently unknown to cause human disease."

scientists said that Disease X could come from many different sources. It could come from existing diseases changing and becoming strong enough to resist our vaccines; it could come from terrorism and bio-weapons; it could also come from scientists using DNA-changing technology to make entirely new viruses. biggest threat could come from animals. U.S. Centers for Disease Control and Prevention said: "Scientists estimate that more than 6 out of every 10 known infectious diseases in people are spread from animals." These include Ebola, avian flu and mad cow disease. Everyone living closer together in cities and increasing international travel and tourism will make it easier for diseases to spread.

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