WHO declares Zika a global health emergency
February 02, 2016  00:25
Zika, a virus that barely bothered humans until last year, has been moving. First, it made its way from Africa to a series of tiny islands in Micronesia. Then it bounced through the Pacific Ocean to Easter Island, off the coast of Chile. 

From there, it was on to Brazil. Now Zika has infected people in more than 20 countries in Central and South America and the Caribbean.The mosquito-borne virus doesn't seem to harm most of its victims. 

But there's increasing evidence that it can cause serious damage to the brains of fetuses and, in rare instances, devastating neurological problems in adults.
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