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Zika timeline: A look at how the mosquito-borne virus spread

The Zika virus was first discovered nearly 70 years ago, but only in this most recent outbreak has it caused so much worldwide concern. Here's a look at Zika's history before it landed in Brazil.

Zika was 1st discovered in 1947, but only gained global attention when Brazil declared a state of emergency

The Zika virus was first discovered nearly 70 years ago, but only in this most recent outbreak has it caused so much worldwide concern.

The virus is transmitted via mosquito. It spread from Africa into Asia, and onto the Pacific Islands, before eventually reaching the Americas.

There have been outbreaks of Zika in the past. But the virus has never before been linked with microcephaly — a birth defect characterized by an abnormally small head that can cause developmental issues.

Here's a look at the timeline of the Zika virus, from discovery to worldwide concern: