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The World Health Organization declared the recent spread of polio to be a health emergency of international concern on Monday, following the virus recent transmission from Pakistan, Cameroon, and Syria to other states in Africa and the Middle East after being pushed to the edge of eradication several years ago. The WHO recommended that these three countries see that all of their residents and long-term visitors do not leave the country without receiving the polio vaccine. The current situation stands in stark contrast to the near-cessation of international spread of wild poliovirus from January 2012 through the 2013 low transmission season for this disease, the WHO writes. Polios high transmission season began this month and will continue through June, and the WHO says that it will take a coordinated international response in order to prevent further spread of wild poliovirus, which can still infect people who have received the inactivated vaccine.