In this Tuesday, July 16, 2019 photo, health workers dressed in protective gear begin their shift at an Ebola treatment center in Beni, Congo DRC. The World Health Organization has declared the Ebola outbreak an international emergency after spreading to eastern Congo's biggest city, Goma, this week. More than 1,600 people in eastern Congo have died as the virus has spread in areas too dangerous for health teams to access. (AP Photo/Jerome Delay)