The existing bed capacity for Ebola patients in Liberia, Sierra Leone and Guinea and Nigeria is about 820, well short of the 2,900 beds that are currently needed, according to the World Health Organization. Recently 737 beds were pledged by countries. Yet even after the promised treatment facilities are built, they will still be at least 2,100 beds short. Statistics reviewed by The Associated Press and interviews with experts and those on the scene of one of the worst health disasters in modern history show how great the needs are and how little the world has done in response. Experts warn that the window of opportunity to snuff out the dreaded disease may close unless promises of assistance immediately become reality.