Spate of babies born with unusually small heads in Brazil linked to terrifying outbreak of mosquito-borne Zika virus

Spate of babies born with unusually small heads in Brazil linked to terrifying outbreak of mosquito-borne Zika virus Researchers in Brazil remain perplexed as to how the Zika virus, first discovered in Africa in 1947, has struck the Americas so quickly after its first case was registered only one year ago.