Scientists from the World Health Organization (WHO) say the world is animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus at risk from a animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus disease. However, they do not know its animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus or what it does and looks like. They have called it 'Disease X'. It could be caused by a animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus or another micro- animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus that scientists don't yet know about. The WHO said Disease X could go unnoticed until it is too animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus and it is quickly spreading around the world. The WHO is taking the animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus of Disease X seriously. It is putting a lot of money into animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus and is preparing a plan for a sudden outbreak. It said: "Disease X represents the animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus that a serious international epidemic could be caused by a [virus] animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus unknown to cause human disease." The scientists said that Disease X could come from animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus different sources. It could come from animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus diseases changing and becoming strong animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus to resist our vaccines; it could come from terrorism and bio-weapons; it could also come from scientists using DNA-changing animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus to make entirely new viruses. The biggest threat could come from animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus . The U.S. Centers for Disease Control and Prevention said: "Scientists estimate that more than 6 out of every 10 known animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus diseases in people are spread from animals." These include Ebola, avian animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus and mad cow disease. Everyone living animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus together in cities and increasing international travel and animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus will make it animals closer currently deadly easier enough existing flu infectious knowledge late many name organism possibly research technology threat tourism virus for diseases to spread.