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Why U.S. is so vulnerable to alarming spread of Zika

Why U.S. is so vulnerable to alarming spread of Zika

With the Zika virus now circulating in two dozen countries and territories across the Americas, the mosquito-borne pathogen seems destined to reach the United States, and likely sooner rather than later.

What is far less certain, say public health and infectious disease experts, is Zika's potential reach and impact here. The South is seen as especially vulnerable because of its warm, humid climate and pockets of poverty where more people live without air-conditioning or proper window screens. Plus, the region is already home to mosquitoes that can transmit the virus.

Some models estimate as many as 200 million people live in areas that might be conducive to the spread of...

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