Why Zika was just declared a global health emergency

The Zika Virus is spreading at an alarming rate through the Americas. Some areas have declared a state of emergency, doctors have described it as "a pandemic in progress" and some are even advising women in affected countries to delay getting pregnant!

The mosquito-borne virus doesn't seem to harm most of its victims. But there's increasing evidence that it may be linked to thousands of babies being born with underdeveloped brains and shrunken heads, known as microcephaly.

But what is the virus, how is it spread and how can people minimise the chances of catching it? In this video, you'll find the answer.

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