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 Public health workers participate in a day of fumigation to stop spread of the 'Aedes aegypti' in Caracas, Venezuela, 28 January 2016. The fast spread of the Zika virus in the Americas has prompted the World Health Organization (WHO) to discuss whether the outbreak constitutes a global health emergency, WHO chief Margaret Chan said on 28 January in Geneva. 'The level of alarm is extremely high,' Chan told WHO member state representatives meeting in Geneva, noting that the virus was spreading 'explosively' through mosquitoes in the region. There are estimates that there may have been 1.5 million Zika cases in this year's Olympic host country Brazil, where the outbreak started last year, senior WHO officials said. Miguel Gutierrez/EPA
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