To Fight Polio Outbreaks, WHO Lays Down New Rules The World Health Organization says that recent polio outbreaks constitute a world health emergency. It's asking polio hot spots to require travelers leaving those countries show proof of vaccination.

To Fight Polio Outbreaks, WHO Lays Down New Rules

To Fight Polio Outbreaks, WHO Lays Down New Rules

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The World Health Organization is warning that recent outbreaks of polio in the Middle East, Africa and Asia mark a setback to the decades-long effort to eradicate the disease. In response, the WHO has declared a world health emergency. It's asking Syria, Pakistan and Cameroon — current polio hot spots — to require all travelers leaving those countries to show proof of vaccination.