Zika virus outbreak IS a 'global public health emergency', says WHO

  • Outbreak of the Zika virus is a global public health emergency, the World Health Organisation warned today
  • The alert puts the mosquito-borne disease in the same category as Ebola, which killed 11,000 people in West Africa
  • Experts predict there could be four million cases of the virus, which has spread to 23 countries, this year
  • WHO director general Dr Margaret Chan called it an ‘extraordinary event’