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Emerging pandemic disease outbreaks such as Ebola increasingly threaten global public health and world economies, scientists say. We can expect five new such diseases each year, into the future. And expect them to spread. The tropical disease dengue fever, for example, has made its way to Florida and Texas, seemingly to stay. But the global response to infectious diseases is often too late to prevent major effects on health and economic growth, researchers believe. [Source: National Science Foundation]
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