Zika, a mosquito-borne virus, has been linked to brain damage in nearly 4,000 newborns in Brazil. There is currently no vaccine or treatment for Zika, a close cousin of dengue and chikungunya, which causes mild fever and rash.
The Zika virus is expected to spread to all countries in the Americas except Canada and Chile, the World Health Organization said on Monday. Zika Virus is explained in this video.