The spread of wild poliovirus is a public-health emergency that requires a coordinated global response, the World Health Organization declared on 5 May. The agency said that people in countries currently spreading cases abroad (Pakistan, Cameroon and Syria) must be vaccinated before travelling; other nations in which polio is endemic (see chart) should encourage immunization. The measures were invoked under the binding International Health Regulations, last used in the 2009 H1N1 influenza pandemic.
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