Zika timeline: A look at how the mosquito-borne virus spread
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.
Here's a look at the timeline of the Zika virus, from discovery to worldwide concern: