The Zika virus is a mosquito-borne illness predominately in Central and South America, but outbreaks have occurred in Africa, Southeast Asia, the Pacific Islands and the Americas, according to the Centers for Disease Control and Prevention.
El Niño has a history of favoring tropical disease in the U.S. With chikungunya and Zika virus knocking on the door, scientists describe what might be in store for the U.S. next year.
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