MONROVIA, LIBERIA - AUGUST 14:  A Liberian health worker sprays disinfectant in a newly-opened Ebola isolation ward set up in a school by the Liberian health ministry, which was closed due to the epidemic on August 14, 2014 in Monrovia, Liberia. People suspected of contracting the Ebola virus are being sent to such centers in the capital Monrovia where the spread of the deadly and highly contagious Ebola virus has been called catastrophic. The epidemic has killed more than 1,000 people in four West African countries.  (Photo by John Moore/Getty Images)