The mosquito-born Zika virus was declared an international public health emergency last week — a designation last used for Ebola — and could infect as many as 4 million people in the Americas this year, according to the World Health Organization. And scientists say climate change could have played a role in the outbreak.
The virus is predominantly spread by the species Aedes aegypti of mosquito, which also carries yellow and dengue fever. The mosquito is prevalent throughout South America and Central America, and now survives year-round in parts of the southern United States. It's been spotted as far north as Washington DC.

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