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The scale of the world's worst Ebola outbreak has been concealed by families hiding infected loved ones in their homes and the existence of "shadow zones" that medics cannot enter, the World Health Organization (WHO) said on Friday. The U.N. agency issued a statement detailing why the outbreak in West Africa had been underestimated, following criticism that it had moved too slowly to contain the killer virus, now spreading out of control. Under-reporting of cases is a problem especially in Liberia and Sierra Leone. The stigma surrounding Ebola poses a serious obstacle to efforts to calibrate the outbreak in Liberia, Sierra Leone, Guinea and Nigeria, which has claimed far more victims than any other episode of the disease that was first discovered nearly 40 years ago in the forests of central Africa.