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

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