MONROVIA, Liberia (AP) — The nurse excitedly grabbed the sheet of paper with 11-year-old Chancey’s lab results. “It’s negative, it’s negative,” she shouted above the sound of her boots pounding the gravel as she ran toward the outdoor Ebola ward.

Soon the boy in a neon green T-shirt came running to the hole in the orange plastic fencing to greet her. The barrier separates health workers from those sick with one of the world’s deadliest diseases.