New research in France, gives the first evidence that Zika virus might cause a severe neurological disorder called Guillain-Barré syndrome.
The study was carried out using blood samples from 42 patients who became ill in a previous outbreak. The study said, patients developed the neurological problems around six days after Zika infection.
Leading scientists described the study as compelling. Zika was declared a public health emergency of international concern by the World Health Organisation in early February.