'Experts worry that the worst is yet to come. Hundreds of thousands of people are fleeing the region in response to ethnic violence, potentially carrying the virus far beyond Congo’s borders. The outbreak has already spread into neighboring Uganda; if it reaches South Sudan, a country dotted with refugee camps and teeming with instability, containment could become nearly impossible. Were the W.H.O. to declare a “public health emergency of international concern,” it might help close the funding gap by drawing the world’s attention to the growing crisis. But the organization has repeatedly declined to do so and, according to critics, has not adequately explained the reasoning behind its decision.'