dcdNew estimates from the World Health Organization warn the number of Ebola cases could hit 21,000 in six weeks unless efforts to curb the outbreak are ramped up. Since the first cases were reported six months ago, the tally of cases in West Africa has reached an estimated 5,800 illnesses. WHO officials say cases are continuing to increase exponentially and Ebola could sicken people for years to come without better control measures. In recent weeks, health officials worldwide have stepped up efforts to provide aid but the virus is still spreading. There aren’t enough hospital beds, health workers or even soap and water in the hardest-hit West African countries: Guinea, Sierra Leone and Liberia. Last week, the U.S. announced it would build more than a dozen medical centers in Liberia and send 3,000 troops to help. Britain and France have also pledged to build treatment centers in Sierra Leone and Guinea and the World Bank and UNICEF have sent more than $1 million worth of supplies to the region. More