In this photo taken on Saturday, July 26, 2014, Liberia President Ellen Johnson Sirleaf, right, demonstrates to people how to wash their hands properly in order to prevent the spread of the Ebola virus, during Independence Day celebrations in the city of Monrovia, Liberia. Scientists from Fort Detrick say the number of Ebola cases in West Africa is much larger than official estimates indicate. Researchers from the U.S. Army Medical Research Institute of Infectious Diseases, who have worked in Sierra Leone and Liberia, say the current outbreak reaches beyond the 1,200 confirmed, suspected or probable cases and over 600 deaths that the World Health Organization has identified in West Africa as of July 23. (AP Photo/Abbas Dulleh) ( Liberia West Africa Ebola )