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

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

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