National Geographic   |  May 26, 2016

Only four factories, in Russia, Brazil, France and Senegal, make the compounds, and one is about to close. But in May, a WHO emergency committee declined to rank yellow fever as a “public health emergency of international concern.” As global health-law scholars Daniel Lucey and Lawrence Gostin wrote in JAMA two weeks ago, that designation could have given the agency increased leverage to negotiate with vaccine manufacturers. (Following the decision, the committee advised “rapid evaluation” of dividing vaccine doses so that more people can be protected.)

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