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New research gives the first evidence that the 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 Lancet authors say the patients developed the neurological problems around six days after Zika infection. Dr David Smith, from the University of Western Australia, co-authored the accompanying study published in the Lancet. (Pic: Mosquitoes tested for Zika virus, Credit: Getty Images)