The World Health Organization will meet today to decide whether the Zika virus outbreak suspected of causing a surge of serious birth defects should be considered a global emergency on the scale of Ebola. The UN health agency warned last week that the mosquito-borne disease was 'spreading explosively' in the Americas, with the region expected to see up to four million cases this year. Experts also fear the warm weather system El Nino will fuel the outbreak by increasing the mosquito population. Brazil sounded the alarm in October, when a rash of microcephaly cases, a devastating condition in which a...