Development: On 15 January the US Center for Disease Control and Prevention (CDC) warned pregnant women not to travel to 14 countries in Latin America, including Brazil, due to an outbreak of the zika virus. Significance: The zika virus, common in Africa and Asia, was detected in Brazil for the first time in May 2015. Like dengue, yellow fever and chikungunya, it is transmitted by the Aedes Aegypti mosquito, which breeds easily in any small pool of stagnant water. Initially, zika was thought to be relatively mild; only one in five carriers developed symptoms. But in October 2015, health specialists…