UNITED NATIONS (AP) — The United Nations has begun training Ebola survivors to help respond to the soaring number of cases in West Africa, because people who’ve lived through the experience are now immune to the disease, UNICEF’s crisis communications chief told reporters Friday.

Sarah Crowe said the U.N. is training the survivors to work with children in Liberia and Sierra Leone who’ve had contact with infected people, often family members, and require 21 days of isolation.