In the unfortunate case of the Americas in 2015-16, a perfect storm of biological events has unfolded -- any one of which by itself would have been relatively harmless. These events include the introduction of Asian and African mosquitoes, the spread of yellow fever and then dengue, followed by chikungunya and now Zika; the El Niño climate event; and a Brazilian crisis in both economics and politics. Combined, these have fueled an explosive spread of the disease, and at least 20 countries have severe enough outbreaks to warrant public health emergencies and travel advisories from the CDC.
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